serial: msm-geni: configure RX watermark register

The SE_GENI_RX_WATERMARK_REG was not being programmed in the RX
setup paths. Set it to DEF_RX_WM (2) in qcom_geni_serial_start_rx(),
msm_geni_serial_setup_rx() and _debug_uart_init() to align with the
Linux kernel driver behaviour.

Without this, the RX FIFO watermark interrupt threshold is left at
its hardware reset value, which may differ from the expected value
and can cause RX data loss or missed watermark interrupts.

Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Timple Raj M <[email protected]>
Signed-off-by: Gurumoorthy Santhakumar <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Sumit Garg <[email protected]>
Reviewed-by: Csey Connolly <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Casey Connolly <[email protected]>

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