msm_serial_hs: handle resource voting with pm callbacks disabled

The resources are voted for in the driver's routines which
access the hardware. When the system resume process has not
completed  or the system is supended, the pm callbacks may
not succeed. Handle this case in all the codepaths so that
resources are turned on.

Change-Id: I482684b02e85eaf74341c2185b78e57997ec2aba
Signed-off-by: Naveen Kaje <nkaje@codeaurora.org>