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/embestmx6boards.h b/include/configs/embestmx6boards.h
index c1748fc..81a92c9 100644
--- a/include/configs/embestmx6boards.h
+++ b/include/configs/embestmx6boards.h
@@ -12,7 +12,7 @@
 #ifndef __RIOTBOARD_CONFIG_H
 #define __RIOTBOARD_CONFIG_H
 
-#define CONFIG_MXC_UART_BASE		UART2_BASE
+#define CFG_MXC_UART_BASE		UART2_BASE
 #define CONSOLE_DEV		"ttymxc1"
 
 #define PHYS_SDRAM_SIZE		(1u * 1024 * 1024 * 1024)