arm/imx6q: add core definitions and low-level debug uart

It adds the core definitions and low-level debug uart support
for imx6q.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 13c0631..a1cb484 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -184,6 +184,13 @@
 		  Say Y here if you want kernel low-level debugging support
 		  on i.MX50 or i.MX53.
 
+	config DEBUG_IMX6Q_UART
+		bool "i.MX6Q Debug UART"
+		depends on SOC_IMX6Q
+		help
+		  Say Y here if you want kernel low-level debugging support
+		  on i.MX6Q.
+
 	config DEBUG_S3C_UART0
 		depends on PLAT_SAMSUNG
 		bool "Use S3C UART 0 for low-level debug"