serial: msm_geni_serial:Add snapshot of serial UART driver

This snapshot is taken as of msm-4.14 'commit <82c5fa13d10>
("Merge "tty: serial: msm_geni_serial : Change AB voting for
console used SE"").

Change-Id: Id797156864faee0ba37a1ade73404a072023a8eb
Signed-off-by: Vipin Deep Kaur <vkaur@codeaurora.org>