Change hello_world to use UART3

Change-Id: I43129bc82f0fffc723c5d5031e1af8003b70a66d
diff --git a/boards/evkmimx8mq/demo_apps/hello_world/board.c b/boards/evkmimx8mq/demo_apps/hello_world/board.c
index 7a5a287..5fc036a 100644
--- a/boards/evkmimx8mq/demo_apps/hello_world/board.c
+++ b/boards/evkmimx8mq/demo_apps/hello_world/board.c
@@ -24,7 +24,7 @@
 void BOARD_InitDebugConsole(void)
 {
     uint32_t uartClkSrcFreq = BOARD_DEBUG_UART_CLK_FREQ;
-    CLOCK_EnableClock(kCLOCK_Uart2);
+    CLOCK_EnableClock(kCLOCK_Uart3);
     DbgConsole_Init(BOARD_DEBUG_UART_INSTANCE, BOARD_DEBUG_UART_BAUDRATE, BOARD_DEBUG_UART_TYPE, uartClkSrcFreq);
 }
 /* Initialize MPU, configure non-cacheable memory */
diff --git a/boards/evkmimx8mq/demo_apps/hello_world/board.h b/boards/evkmimx8mq/demo_apps/hello_world/board.h
index 127e18c..b106a04 100644
--- a/boards/evkmimx8mq/demo_apps/hello_world/board.h
+++ b/boards/evkmimx8mq/demo_apps/hello_world/board.h
@@ -19,13 +19,13 @@
 /* The UART to use for debug messages. */
 #define BOARD_DEBUG_UART_TYPE     kSerialPort_Uart
 #define BOARD_DEBUG_UART_BAUDRATE 115200u
-#define BOARD_DEBUG_UART_BASEADDR UART2_BASE
-#define BOARD_DEBUG_UART_INSTANCE 2U
+#define BOARD_DEBUG_UART_BASEADDR UART3_BASE
+#define BOARD_DEBUG_UART_INSTANCE 3U
 #define BOARD_DEBUG_UART_CLK_FREQ                                                           \
-    CLOCK_GetPllFreq(kCLOCK_SystemPll1Ctrl) / (CLOCK_GetRootPreDivider(kCLOCK_RootUart2)) / \
-        (CLOCK_GetRootPostDivider(kCLOCK_RootUart2)) / 10
-#define BOARD_UART_IRQ         UART2_IRQn
-#define BOARD_UART_IRQ_HANDLER UART2_IRQHandler
+    CLOCK_GetPllFreq(kCLOCK_SystemPll1Ctrl) / (CLOCK_GetRootPreDivider(kCLOCK_RootUart3)) / \
+        (CLOCK_GetRootPostDivider(kCLOCK_RootUart3)) / 10
+#define BOARD_UART_IRQ         UART3_IRQn
+#define BOARD_UART_IRQ_HANDLER UART3_IRQHandler
 
 /* Shared memory base for RPMsg communication. */
 #define VDEV0_VRING_BASE (0xB8000000U)
diff --git a/boards/evkmimx8mq/demo_apps/hello_world/clock_config.c b/boards/evkmimx8mq/demo_apps/hello_world/clock_config.c
index 2cce38d..4d776d0 100644
--- a/boards/evkmimx8mq/demo_apps/hello_world/clock_config.c
+++ b/boards/evkmimx8mq/demo_apps/hello_world/clock_config.c
@@ -136,8 +136,8 @@
     CLOCK_SetRootDivider(kCLOCK_RootAxi, 3U, 1U);
     CLOCK_SetRootMux(kCLOCK_RootAxi, kCLOCK_AxiRootmuxSysPll1); /* switch AXI to SYSTEM PLL1 = 266MHZ */
 
-    CLOCK_SetRootMux(kCLOCK_RootUart2, kCLOCK_UartRootmuxSysPll1Div10); /* Set UART source to SysPLL1 Div10 80MHZ */
-    CLOCK_SetRootDivider(kCLOCK_RootUart2, 1U, 1U);                     /* Set root clock to 80MHZ/ 1= 80MHZ */
+    CLOCK_SetRootMux(kCLOCK_RootUart3, kCLOCK_UartRootmuxSysPll1Div10); /* Set UART source to SysPLL1 Div10 80MHZ */
+    CLOCK_SetRootDivider(kCLOCK_RootUart3, 1U, 1U);                     /* Set root clock to 80MHZ/ 1= 80MHZ */
 
     CLOCK_EnableClock(kCLOCK_Rdc); /* Enable RDC clock */
 
diff --git a/boards/evkmimx8mq/demo_apps/hello_world/pin_mux.c b/boards/evkmimx8mq/demo_apps/hello_world/pin_mux.c
index 652df96..4c5fa8c 100644
--- a/boards/evkmimx8mq/demo_apps/hello_world/pin_mux.c
+++ b/boards/evkmimx8mq/demo_apps/hello_world/pin_mux.c
@@ -54,13 +54,13 @@
  *
  * END ****************************************************************************************************************/
 void BOARD_InitPins(void) {                                /*!< Function assigned for the core: Cortex-M4[m4] */
-    IOMUXC_SetPinMux(IOMUXC_UART2_RXD_UART2_RX, 0U);
-    IOMUXC_SetPinConfig(IOMUXC_UART2_RXD_UART2_RX, 
+    IOMUXC_SetPinMux(IOMUXC_UART3_RXD_UART3_RX, 0U);
+    IOMUXC_SetPinConfig(IOMUXC_UART3_RXD_UART3_RX,
                         IOMUXC_SW_PAD_CTL_PAD_DSE(6U) |
                         IOMUXC_SW_PAD_CTL_PAD_SRE(1U) |
                         IOMUXC_SW_PAD_CTL_PAD_PUE_MASK);
-    IOMUXC_SetPinMux(IOMUXC_UART2_TXD_UART2_TX, 0U);
-    IOMUXC_SetPinConfig(IOMUXC_UART2_TXD_UART2_TX, 
+    IOMUXC_SetPinMux(IOMUXC_UART3_TXD_UART3_TX, 0U);
+    IOMUXC_SetPinConfig(IOMUXC_UART3_TXD_UART3_TX,
                         IOMUXC_SW_PAD_CTL_PAD_DSE(6U) |
                         IOMUXC_SW_PAD_CTL_PAD_SRE(1U) |
                         IOMUXC_SW_PAD_CTL_PAD_PUE_MASK);