serial: msm: Reset after writing to DMEN

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 <neil.armstrong@linaro.org>
Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Tested-by: Alexey Minnekhanov <alexeymin@minlexx.ru>
Acked-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250908-db410c-autoboot-fixes-v2-4-316ed98e0143@linaro.org
Signed-off-by: Casey Connolly <kcxt@postmarketos.org>