mx6sxsabresd: support qspi flash bigger than 16MB

mx6sxsabresd revb board uses 32MB qspi flash, reva board uses 16MB qspi
flash. Currently, the default supported platform is revb board.

If want to configure for reva board, just define CONFIG_MX6SX_SABRESD_REVA
in mx6sxsabresd.h to support reva qspi flashes whose size is 16MB.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

include/configs/mx6sxsabresd.h

@@ -240,10 +240,15 @@
 #ifdef CONFIG_FSL_QSPI
 #define CONFIG_CMD_SF
 #define CONFIG_SPI_FLASH
+#define CONFIG_SPI_FLASH_BAR
 #define CONFIG_SPI_FLASH_SPANSION
 #define CONFIG_SPI_FLASH_STMICRO
 #define CONFIG_SYS_FSL_QSPI_LE
+#ifdef CONFIG_MX6SX_SABRESD_REVA
 #define FSL_QSPI_FLASH_SIZE		SZ_16M
+#else
+#define FSL_QSPI_FLASH_SIZE		SZ_32M
+#endif
 #define FSL_QSPI_FLASH_NUM		2
 #endif