global: Migrate CONFIG_MXC_UART_BASE to CFG

Perform a simple rename of CONFIG_MXC_UART_BASE to CFG_MXC_UART_BASE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/dh_imx6.h b/include/configs/dh_imx6.h
index 6aef15c..348be5a 100644
--- a/include/configs/dh_imx6.h
+++ b/include/configs/dh_imx6.h
@@ -28,7 +28,7 @@
 #define CFG_SYS_FSL_USDHC_NUM	3
 
 /* UART */
-#define CONFIG_MXC_UART_BASE		UART1_BASE
+#define CFG_MXC_UART_BASE		UART1_BASE
 
 /* USB Configs */
 #ifdef CONFIG_CMD_USB