Revert "serial: max310x: fix IO data corruption in batched operations"

This reverts commit a1211bbf which is
commit 3f42b142 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: Ic6c304a74143ede4d51270d1d1617bea82284afd
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>