The TCSR clock controller found on SM8550 provides refclks
for PCIE, USB and UFS. Add clock driver for it.

This patch is based on initial code downstream.
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230104093450.3150578-5-abel.vesa@linaro.org