ARM: imx: Remove mx508 support

Only mx508 based board is mach-mx50_rdp and it has been marked as BROKEN
for several releases.

mx508 currently lacks clock support.

In case someone needs to add mx508 support back, then the recommended approach
is to use device tree.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 661030d..1dceb8e 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -219,12 +219,12 @@
 		  Say Y here if you want kernel low-level debugging support
 		  on i.MX51.
 
-	config DEBUG_IMX50_IMX53_UART
-		bool "i.MX50 and i.MX53 Debug UART"
-		depends on SOC_IMX50 || SOC_IMX53
+	config DEBUG_IMX53_UART
+		bool "i.MX53 Debug UART"
+		depends on SOC_IMX53
 		help
 		  Say Y here if you want kernel low-level debugging support
-		  on i.MX50 or i.MX53.
+		  on i.MX53.
 
 	config DEBUG_IMX6Q_UART
 		bool "i.MX6Q Debug UART"
@@ -497,7 +497,7 @@
 				 DEBUG_IMX21_IMX27_UART || \
 				 DEBUG_IMX31_IMX35_UART || \
 				 DEBUG_IMX51_UART || \
-				 DEBUG_IMX50_IMX53_UART ||\
+				 DEBUG_IMX53_UART ||\
 				 DEBUG_IMX6Q_UART
 	default "debug/highbank.S" if DEBUG_HIGHBANK_UART
 	default "debug/mvebu.S" if DEBUG_MVEBU_UART