clk: qcom: add the GCC driver for sa8775p

Add support for the Global Clock Controller found in the QTI SA8775P
platforms.

Signed-off-by: Shazad Hussain <quic_shazhuss@quicinc.com>
[Bartosz: made the driver ready for upstream]
Co-developed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
[bjorn: Moved to core_initcall(), per request of Konrad]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117180429.305266-3-brgl@bgdev.pl