ntfs3: remove legacy ntfs driver support
Reverts the following commits that introduced legacy ntfs
driver alias and related support code:
74871791ffa9 ntfs3: serve as alias for the legacy ntfs driver
1ff2e956608c fs/ntfs3: Redesign legacy ntfs support
9b872cc50daa ntfs3: add legacy ntfs file operations
d55f90e9b243 ntfs3: enforce read-only when used as legacy ntfs driver
The legacy ntfs driver has been remade as a new implementation, so the
alias and related codes in ntfs3 are no longer needed.
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>