Update LED behavior at powering up

At powering up, both green and red LEDs are on. Only after a successful
boot the LED status will change to green. This is used to indicate the
emergency mode.

Also update the u-boot console message of MMC capacity detection.

Bug: 171704186
Change-Id: I09b22ba9c629cac501ee4c2e9a2f792cfe93dd59
diff --git a/board/mediatek/mt8516-coral/mt8516-coral.c b/board/mediatek/mt8516-coral/mt8516-coral.c
index fb813fd..700be06 100644
--- a/board/mediatek/mt8516-coral/mt8516-coral.c
+++ b/board/mediatek/mt8516-coral/mt8516-coral.c
@@ -58,7 +58,9 @@
 		}
 	}
 
-	// Set Green LED on
+	// Set Red and Green LEDs on
+	gpio_request(18, "led_red");
+	gpio_direction_output(18, 1);
 	gpio_request(19, "led_green");
 	gpio_direction_output(19, 1);
 
@@ -69,7 +71,7 @@
 	mmc = find_mmc_device(mmc_dev);
 	if (mmc) {
 		if (!mmc_init(mmc) && mmc->capacity >= 7000000000) {
-			printf("EVT2 detected\n");
+			printf("8GB mmc detected\n");
 			env_set("evt2_board", "1");
 
 			// Try to detect A71CH on the I2C bus.