kernel: remove useless feature

nanopi-r2_linux_defconfig

@@ -66,7 +66,6 @@ CONFIG_ARCH_ROCKCHIP=y
 CONFIG_SCHED_MC=y
 CONFIG_NR_CPUS=8
 CONFIG_SECCOMP=y
-CONFIG_ARM64_SW_TTBR0_PAN=y
 CONFIG_COMPAT=y
 CONFIG_ARMV8_DEPRECATED=y
 CONFIG_SWP_EMULATION=y
@@ -111,7 +110,6 @@ CONFIG_MAC_PARTITION=y
 CONFIG_IOSCHED_BFQ=m
 CONFIG_BFQ_GROUP_IOSCHED=y
 CONFIG_BINFMT_MISC=m
-CONFIG_FLATMEM_MANUAL=y
 CONFIG_TRANSPARENT_HUGEPAGE=y
 CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y
 CONFIG_CLEANCACHE=y
@@ -622,13 +620,6 @@ CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_FW_LOADER_USER_HELPER=y
 CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
 CONFIG_GNSS=m
-CONFIG_MTD=y
-CONFIG_MTD_SPLIT_SQUASHFS_ROOT=y
-CONFIG_MTD_BLOCK=y
-CONFIG_MTD_CFI=y
-CONFIG_MTD_CFI_INTELEXT=y
-CONFIG_MTD_CFI_AMDSTD=y
-CONFIG_MTD_COMPLEX_MAPPINGS=y
 CONFIG_OF_OVERLAY=y
 CONFIG_BLK_DEV_PCIESSD_MTIP32XX=m
 CONFIG_ZRAM=m
@@ -1484,11 +1475,6 @@ CONFIG_ECRYPT_FS=m
 CONFIG_ECRYPT_FS_MESSAGING=y
 CONFIG_HFS_FS=m
 CONFIG_HFSPLUS_FS=m
-CONFIG_JFFS2_FS=y
-CONFIG_JFFS2_SUMMARY=y
-CONFIG_JFFS2_FS_XATTR=y
-CONFIG_JFFS2_COMPRESSION_OPTIONS=y
-CONFIG_JFFS2_LZMA=y
 CONFIG_SQUASHFS=y
 CONFIG_SQUASHFS_FILE_DIRECT=y
 CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU=y