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

This reverts commit 738845b0 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: Ied21b43d2f2d803f37646a0eca94c399f447c504
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>