arm64: dts: qcom: msm8996: add cxo and sleep-clk to gcc node

Supply proper cxo (RPM_SMD_BB_CLK1) and sleep_clk to the gcc clock
controller node.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220215201539.3970459-5-dmitry.baryshkov@linaro.org