devicetree: bindings: Document qcom,gcc

Document the global clock controller found on Qualcomm devices.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --cc Documentation/devicetree/bindings/clock/qcom,gcc.txt
Simple merge