Revert "Revert "8250: add support for ASIX devices with a FIFO bug""

This reverts commit 0697a1a5 which is
commit a82d62f708545d22859584e0e0620da8e3759bbc upstream.

It changes the serial port ABI, which Android cares about.  As the issue
isn't really a problem at all for any Android devices, just revert it
keeping the fix present for now, to preserve the abi.

Bug: 161946584
Change-Id: Ie9b3f9aa8e705c63680fb9556e579e6241589d74
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>