warp7: configs: enable CONFIG_CMD_FS_GENERIC

This enable generic file system commands (load, ls).
Signed-off-by: NPierre-Jean TEXIER <texier.pj2@gmail.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
Acked-by: NBryan O'Donoghue <bryan.odonoghue@linaro.org>

configs/warp7_defconfig

@@ -26,6 +26,7 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DFU_MMC=y
 CONFIG_FSL_ESDHC=y