serial: msm_geni_serial: Check for wakeup byte after suspend

As part of commit '2d390a26b7695 ("serial: msm_geni_serial:
Check for wakeup byte after suspend")', wakeup byte is not
being checked as part of suspend resulting in failure.

Enable the check for wakeup byte after suspend, so that
wakeup isr function handles it.

Change-Id: Ibb3276b3e8584b0ef79d5809158f2cbba4e283c1
Signed-off-by: Prasanna S <quic_prass@quicinc.com>
Signed-off-by: Panicker Harish <quic_pharish@quicinc.com>