clocksource/drivers/st_lpc: Fix Kconfig dependency

Change the Kconfig selection rule by letting the STI arch to select
the timer.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
diff --git a/arch/arm/mach-sti/Kconfig b/arch/arm/mach-sti/Kconfig
index 125865d..12dd1dc 100644
--- a/arch/arm/mach-sti/Kconfig
+++ b/arch/arm/mach-sti/Kconfig
@@ -3,6 +3,7 @@
 	select ARM_GIC
 	select ST_IRQCHIP
 	select ARM_GLOBAL_TIMER
+	select CLKSRC_ST_LPC
 	select PINCTRL
 	select PINCTRL_ST
 	select MFD_SYSCON
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index b423785..3594a2b 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -326,7 +326,6 @@
 
 config CLKSRC_ST_LPC
 	bool
-	depends on ARCH_STI
 	select CLKSRC_OF if OF
 	help
 	  Enable this option to use the Low Power controller timer