ARM: rmobile: Enable MTD partitioning on Gen2 with SF

Enable MTD partitioning support on Gen2 boards with SPI NORs.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

include/configs/rcar-gen2-common.h

@@ -51,4 +51,12 @@
 #define CONFIG_ENV_SIZE		(CONFIG_ENV_SECT_SIZE)
 #define CONFIG_ENV_SIZE_REDUND	(CONFIG_SYS_MONITOR_LEN)
 
+/* SF MTD */
+#if defined(CONFIG_SPI_FLASH_MTD) && !defined(CONFIG_SPL_BUILD)
+#define CONFIG_MTD_DEVICE
+#define CONFIG_MTD_PARTITIONS
+#else
+#undef CONFIG_SPI_FLASH_MTD
+#endif
+
 #endif	/* __RCAR_GEN2_COMMON_H */