clk: qcom: Add DT bindings for SDM845 gcc clock controller

Add compatible string and the include file for gcc clock
controller for SDM845.

Signed-off-by: Amit Nischal <anischal@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>