UPSTREAM: tty: serial: qcom-geni-serial: remove unused symbols

Drop all unused symbols from the driver.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-4-brgl@bgdev.pl


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

Bug: 370629635
Bug: 375550406
Change-Id: I855656c04c69602c8dfc391424ba4b395f08d91e
(cherry picked from commit 68c6bd92)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>
(cherry picked from commit b92a6c85)