MX28: remove CONFIG_DEFAULT_SPI_CS

This macro is defined, but not referenced by anyone.

I did not touch config_whitelist.txt - the CONFIG will be dropped
by the next re-sync.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

include/configs/bg0900.h

@@ -27,7 +27,6 @@
 /* SPI */
 #ifdef CONFIG_CMD_SPI
 #define CONFIG_DEFAULT_SPI_BUS		2
-#define CONFIG_DEFAULT_SPI_CS		0
 #define CONFIG_DEFAULT_SPI_MODE		SPI_MODE_0
 
 /* SPI FLASH */

include/configs/m28evk.h

@@ -72,7 +72,6 @@
 /* SPI */
 #ifdef CONFIG_CMD_SPI
 #define CONFIG_DEFAULT_SPI_BUS		2
-#define CONFIG_DEFAULT_SPI_CS		0
 #define CONFIG_DEFAULT_SPI_MODE		SPI_MODE_0
 
 /* SPI FLASH */