dt-bindings: clock: Add Qualcomm SA8775P GCC

Add DT bindings for the GCC clock on SA8775P platforms. Add relevant
DT include definitions as well.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117180429.305266-2-brgl@bgdev.pl