serial: msm_geni_serial: Log CTS and RX IO line status

This change adds the status of UART input lines namely CTS and RX.
These two lines are driven from peer device hence it helps in debug
to confirm peer device status.

This is requested by BT HOST driver to help understand logs clearly.

Change-Id: I892961a5889aea1f46fed1fbde2c924844bc3946
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>