serial: msm: Reset after writing to DMEN

According to the documentation of the UART controller in the APQ8016E TRM,
clearing bits inside UARTDM_DMEN requires resetting the transmitter and/or
receiver. We do reset inside uart_dm_init(), but before writing to
UARTDM_DMEN. This doesn't seem to cause problems in practice, but let's
move the reset to the end of uart_dm_init() to better match the
recommendations in the documentation.

Reviewed-by: Neil Armstrong <[email protected]>
Signed-off-by: Stephan Gerhold <[email protected]>
Tested-by: Alexey Minnekhanov <[email protected]>
Acked-by: Sumit Garg <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Casey Connolly <[email protected]>

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