UPSTREAM: tty: serial: qcom-geni-serial: refactor qcom_geni_serial_isr()

Simplify the conditions in qcom_geni_serial_isr() and fix indentation.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20221229155030.418800-8-brgl@bgdev.pl


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

Bug: 370629635
Change-Id: Idd2f22b9a0ca3e9393c6c91d539127dbcad84609
(cherry picked from commit fe6a00e8)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>