MLK-13335 mx6sl: Fix build break for all i.MX6SL boards

Since the UART1 register base name is changed from UART1_IPS_BASE_ADDR
to UART1_BASE to align with other i.MX6 chips. Should update the board
configuration header file with the new name.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 18019b8f)

include/configs/mx6slevk.h

@@ -39,7 +39,7 @@
 #define CONFIG_BOARD_LATE_INIT
 
 #define CONFIG_MXC_UART
-#define CONFIG_MXC_UART_BASE		UART1_IPS_BASE_ADDR
+#define CONFIG_MXC_UART_BASE		UART1_BASE
 
 /* MMC Configs */
 #define CONFIG_SYS_FSL_ESDHC_ADDR	USDHC2_BASE_ADDR

include/configs/warp.h

@@ -22,7 +22,7 @@
 #define CONFIG_BOARD_LATE_INIT
 
 #define CONFIG_MXC_UART
-#define CONFIG_MXC_UART_BASE		UART1_IPS_BASE_ADDR
+#define CONFIG_MXC_UART_BASE		UART1_BASE
 
 /* MMC Configs */
 #define CONFIG_SYS_FSL_ESDHC_ADDR	USDHC2_BASE_ADDR