clk: qcom: smd-rpm: msm8936: Add PMIC gated RPM_SMD_XO_*

The XO crystal input is buffered through the PMIC and controlled by RPM.
Create the relevant clock gate representation in the RPM clock definitions.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117024846.1367794-5-bryan.odonoghue@linaro.org