m28: Properly configure the SPI flash chipselect

The SPI flash is not properly detected by plain "sf probe" due to
it being located on different bus and different chipselect. Fix
this problem.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Tom Rini <trini@ti.com>

include/configs/m28evk.h

@@ -246,18 +246,20 @@
 #define	CONFIG_MXS_SPI_DMA_ENABLE
 #define	CONFIG_SPI_HALF_DUPLEX
 #define	CONFIG_DEFAULT_SPI_BUS		2
+#define	CONFIG_DEFAULT_SPI_CS		0
 #define	CONFIG_DEFAULT_SPI_MODE		SPI_MODE_0
 
 /* SPI FLASH */
 #ifdef	CONFIG_CMD_SF
 #define	CONFIG_SPI_FLASH
 #define	CONFIG_SPI_FLASH_STMICRO
-#define	CONFIG_SF_DEFAULT_CS		2
-#define	CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
+#define	CONFIG_SF_DEFAULT_BUS		2
+#define	CONFIG_SF_DEFAULT_CS		0
 #define	CONFIG_SF_DEFAULT_SPEED		40000000
+#define	CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
 
-#define	CONFIG_ENV_SPI_CS		0
 #define	CONFIG_ENV_SPI_BUS		2
+#define	CONFIG_ENV_SPI_CS		0
 #define	CONFIG_ENV_SPI_MAX_HZ		40000000
 #define	CONFIG_ENV_SPI_MODE		SPI_MODE_0
 #endif