serial: msm_geni_serial: Control RFR manually when RX aborts

This is to control RFR manually and set it to LOW i.e. FLOW ON when
cancel Fails for some reason. That in turn forces abort operation
which sets RFR to HIGH as part of force default configuration through
FW.

RFR HIGH prevents peer device to send any data to UART, this should
prevent such scenarios post cancel fail.

Change-Id: If50782e94222f08fca08b171844c797506530441
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>