UPSTREAM: tty: serial: qcom-geni-serial: drop unneeded forward definitions

If we shuffle the code a bit, we can drop all forward definitions of
various static functions.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20221229155030.418800-3-brgl@bgdev.pl


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

Bug: 370629635
Bug: 375550406
Change-Id: If741a90295960d502af58641c4db61ab14b1dabe
(cherry picked from commit d0fabb0d)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>
(cherry picked from commit 6e6cda8f)