Revert "f2fs: fix to avoid out-of-boundary access in devs.path"

This reverts commit 70849d33 which is
commit 56619985 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Iddaeb15f30e44a593eba336d7a513f3556eb2426
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>