mx7dsabresd: Define serial port locally

CONFIG_MXC_UART_BASE should not be defined in mx7_common.h as
the console port can vary from board to board.

Define CONFIG_MXC_UART_BASE locally instead.
Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com>

include/configs/mx7_common.h

@@ -77,7 +77,6 @@
 
 /* UART */
 #define CONFIG_MXC_UART
-#define CONFIG_MXC_UART_BASE            UART1_IPS_BASE_ADDR
 
 /* MMC */
 #define CONFIG_MMC

include/configs/mx7dsabresd.h

@@ -14,6 +14,8 @@
 #define CONFIG_DBG_MONITOR
 #define PHYS_SDRAM_SIZE			SZ_1G
 
+#define CONFIG_MXC_UART_BASE            UART1_IPS_BASE_ADDR
+
 /* Uncomment to enable secure boot support */
 /* #define CONFIG_SECURE_BOOT */
 #define CONFIG_CSF_SIZE			0x4000