serial: msm_geni_serial: Make HW Flow off if CRSTCTS flag not set

Presently, if CRTSCTS flag is set, then we turn the HW flow On but
we are doing nothing when CRTSCTS flag is not set.

If CTSRTS flag is not set, then make the HW flow off.

Change-Id: I15881b4063c5a695ca8575a08690822dd71f94a3
Signed-off-by: Prasanna S <quic_prass@quicinc.com>
Signed-off-by: Panicker Harish <quic_pharish@quicinc.com>