fs/ntfs3: Merge synonym COMPRESSION_UNIT and NTFS_LZNT_CUNIT

[ Upstream commit 487f8d48 ]

COMPRESSION_UNIT and NTFS_LZNT_CUNIT mean the same thing
(1u<<NTFS_LZNT_CUNIT) determines the size for compression (in clusters).

COMPRESS_MAX_CLUSTER is not used in the code.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Stable-dep-of: 25610ff9 ("fs/ntfs3: Fix transform resident to nonresident for compressed files")
Signed-off-by: Sasha Levin <sashal@kernel.org>