clk: qcom: Add SDX55 GCC support

Add Global Clock Controller (GCC) support for SDX55 SoCs from Qualcomm.

Signed-off-by: Naveen Yadav <naveenky@codeaurora.org>
[mani: converted to parent_data, commented critical clocks, cleanups]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20201126072844.35370-3-manivannan.sadhasivam@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>