UPSTREAM: tty: serial: qcom-geni-serial: split out the FIFO tx code

qcom_geni_serial_handle_tx() is pretty big, let's move the code that
handles the actual writing of data to a separate function which makes
sense in preparation for introducing a dma variant of handle_tx().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-10-brgl@bgdev.pl


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 370629635
Change-Id: Id456ba7c9a15ea7e05f4dc18f50d03390dbffda1
(cherry picked from commit d420fb49)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>