serial: add snapshot of msm_serial_hs_lite driver

This is a snapshot of the msm_serial_hs_lite driver as of msm-3.10
commit:

acdce027751d5a7488b283f0ce3111f873a5816d (Merge "defconfig: arm64:
Enable ONESHOT_SYNC for msm8994")

Replaced wake_lock usage with the more upstream friendly wakeup_source.

Signed-off-by: Josh Cartwright <joshc@codeaurora.org>