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

This reverts commit 59b3583d 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: I176b89e22005da00d9208b6e5ff2898e6b5ac9ee
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>