serial: msm-geni: implement firmware loading

serial: msm-geni: implement firmware loading

Teach the GENI UART driver to load firmware, similar to i2c.

This is primarily intended for non-debug UARTs, but since we don't
support using these as the console we abort probe for now.

Remove duplicated register macros that are in the common geni-se header.

Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
Link: https://patch.msgid.link/20250714-geni-load-fw-v5-7-5abbc0d29838@linaro.org
Signed-off-by: Casey Connolly <kcxt@postmarketos.org>