BACKPORT: tty: serial: qcom-geni-serial: add support for serial engine DMA

The qcom-geni-serial driver currently only works in SE FIFO mode. This
limits the UART speed to around 180 kB/s. In order to achieve higher
speeds we need to use SE DMA mode.

Keep the console port working in FIFO mode but extend the code to use
DMA
for the high-speed port.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-15-brgl@bgdev.pl


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

Bug: 370629635
Change-Id: I0880354e27e04cb1a49a4759d6df7fe315311574
(cherry picked from commit 2aaa43c7)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>