ioctl support for sanitize in eMMC
https://android.googlesource.com/kernel/msm.git/+/73937f5face75e05ec2a72966d04f4e20aa18379

Changes committed:
modified:   block/blk-core.c
modified:   block/blk-lib.c
modified:   block/blk-merge.c
modified:   block/cfq-iosched.c
modified:   block/elevator.c
modified:   block/ioctl.c
modified:   fs/block_dev.c
modified:   include/linux/blk_types.h
modified:   include/linux/blkdev.h
modified:   include/linux/fs.h
modified:   kernel/trace/blktrace.c