ARM: rmobile: Represent SF partitioning with mtdparts on Lager

Add mtdparts description for the board.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

configs/lager_defconfig

@@ -46,6 +46,9 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
+CONFIG_CMD_MTDPARTS=y
+CONFIG_MTDIDS_DEFAULT="nor0=spi0.0"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=spi0.0:256k(u-boot-spl),512k(u-boot-env1),512k(u-boot-env2),768k(u-boot),-(user)"
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
@@ -59,9 +62,11 @@ CONFIG_SYS_I2C_RCAR_IIC=y
 CONFIG_DM_MMC=y
 CONFIG_SH_MMCIF=y
 CONFIG_RENESAS_SDHI=y
+CONFIG_MTD=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y
 CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_MTD=y
 CONFIG_PHY_MICREL=y
 CONFIG_DM_ETH=y
 CONFIG_SH_ETHER=y