NTFS: Split ntfs_aops into ntfs_normal_aops and ntfs_compressed_aops

in preparation for them diverging.

Signed-off-by: Anton Altaparmakov <anton@tuxera.com>

diff --cc fs/ntfs/aops.c
Simple merge

diff --cc fs/ntfs/inode.c
Simple merge

diff --cc fs/ntfs/ntfs.h
Simple merge