clk: qcom: Add Global Clock controller (GCC) driver for SC7180

Add support for the global clock controller found on SC7180
based devices. This should allow most non-multimedia device
drivers to probe and control their clocks.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/20191014102308.27441-6-tdas@codeaurora.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>