serial: msm_geni_serial: Fix DMA RX FSM reset sequence

Update the DMA RX FSM reset sequence as per HPG recommendations.

Currently driver calling msm_geni_serial_rx_fsm_rst() even in case of
RX inactive. RX FSM reset command generates RX_RESET_DONE bit. There
is a possible race between polling for RX_RESET and ISR for RX_RESET.
This can result into introducing delay during BT open.

Fix this by updating RX FSM reset sequence only in case of
cancel command timeout.

Change-Id: I90532aa72fdad462a616eded3e149bc6b721fe7b
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>