mm: readahead increase VM_MAX_READAHEAD to 512
Revert "TIMA: Removed!"

This reverts commit 9454fca34fd91e14a3fce5469663bead2bc4a20f.
Merge branch 'immortal-upstream' into immortal-new
configs: Update
build_export.sh: Replay 'pwd' to $KERNEL_DIR
Ramdisk: Import ramdisk.
and Update script