Revert "fs: Remove NTFS classic"

This reverts commit 7ffa8f3d30.

Reverts the removal of the classic read-only ntfs driver to
serve as the base for a new read-write ntfs implementation.
If we stack changes on top of the revert patch, It will significantly
reduce the diff size, making the review easier.

This revert intentionally excludes the restoration of Kconfig and
Makefile. The Kconfig and Makefile will be added back in the final patch
of this series, enabling the driver only after all features and
improvements have been applied.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

CREDITS

@@ -71,11 +71,6 @@ D: dosfs, LILO, some fd features, ATM, various other hacks here and there
 S: Buenos Aires
 S: Argentina
 
-NTFS FILESYSTEM
-N: Anton Altaparmakov
-E: anton@tuxera.com
-D: NTFS filesystem
-
 N: Tim Alpaerts
 E: tim_alpaerts@toyota-motor-europe.com
 D: 802.2 class II logical link control layer,