arm64: defconfig: Enable UBIFS

UBIFS is a file system for flash devices which works on top of UBI.
Signed-off-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/r/20230417092243.967871-1-d-gole@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/configs/defconfig

@@ -267,6 +267,8 @@ CONFIG_MTD_NAND_BRCMNAND=m
 CONFIG_MTD_NAND_FSL_IFC=y
 CONFIG_MTD_NAND_QCOM=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_UBI=m
+CONFIG_UBIFS_FS=m
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_NBD=m
 CONFIG_VIRTIO_BLK=y