arm: socfpga: config: Make CONFIG_SPI_FLASH_MTD useful

Enable the mtdparts command and related options to make support
for SPI NOR MTD useful in any way. With the mtdparts command in
place, it is possible to use partition of the SPI NOR in U-Boot.
Signed-off-by: NMarek Vasut <marex@denx.de>

include/configs/socfpga_common.h

@@ -199,6 +199,10 @@ unsigned int cm_get_l4_sp_clk_hz(void);
 #define CONFIG_SPI_FLASH_SPANSION	/* Spansion flash */
 #ifndef CONFIG_SPL_BUILD
 #define CONFIG_SPI_FLASH_MTD
+#define CONFIG_CMD_MTDPARTS
+#define CONFIG_MTD_DEVICE
+#define CONFIG_MTD_PARTITIONS
+#define MTDIDS_DEFAULT			"nor0=ff705000.spi"
 #endif
 /* QSPI reference clock */
 #ifndef __ASSEMBLY__