ARM: socfpga: Enable part command for socfpga platform

Enable CONFIG_CMD_PART item, as default environment requires it
and complains this command in unknown.

Signed-off-by: Andrey Zhizhikin <andrey.z@gmail.com>
diff --git a/configs/socfpga_sr1500_defconfig b/configs/socfpga_sr1500_defconfig
index 961b862..c8239e7 100644
--- a/configs/socfpga_sr1500_defconfig
+++ b/configs/socfpga_sr1500_defconfig
@@ -36,6 +36,7 @@
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_CMD_PART=y
 CONFIG_MTDIDS_DEFAULT="nor0=ff705000.spi.0"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=ff705000.spi.0:1m(u-boot),256k(env1),256k(env2),14848k(boot),16m(rootfs),-@1536k(UBI)0"
 CONFIG_CMD_UBI=y