f2fs: Use generic casefolding support

This switches f2fs over to the generic support provided in
the previous patch.

Since casefolded dentries behave the same in ext4 and f2fs, we decrease
the maintenance burden by unifying them, and any optimizations will
immediately apply to both.

Signed-off-by: Daniel Rosenberg <[email protected]>
Reviewed-by: Eric Biggers <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
5 files changed