ARM: dts: qcom: msm8226: add RPMCC node

Add a node for the RPM Clock Controller on MSM8226.

Signed-off-by: Rayyan Ansari <rayyan@ansari.sh>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230118181343.438373-1-rayyan@ansari.sh