configs: imx: Use CONFIG_SF_DEFAULT_CS

CONFIG_SPI_FLASH_CS is not used anywhere.

Use CONFIG_SF_DEFAULT_CS instead.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index 4d59153..4b97c71 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -252,7 +252,7 @@
 #ifdef	CONFIG_CMD_SF
 #define	CONFIG_SPI_FLASH
 #define	CONFIG_SPI_FLASH_STMICRO
-#define	CONFIG_SPI_FLASH_CS		2
+#define	CONFIG_SF_DEFAULT_CS		2
 #define	CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
 #define	CONFIG_SF_DEFAULT_SPEED		24000000