Revert "Revert "Revert "msm_serial_hs: Revert to LGEs hammerhead-3.4-kitkat-mr2 driver"""

This reverts commit 501e3f58a0caa1a3520c4ea541c96ecdb013defa.
msm_serial_hs: Handle client requests without port open

Adding defensive checks in the APIs to handle the
client driver requests calling without port open.

Change-Id: I0d618abbc7a38151651550a07aa909689ce92054
Signed-off-by: Dilip Kota <c_dkota@codeaurora.org>