dt-bindings: clock: Add YAML schemas for QCOM A53 PLL

This patch adds schema for primary CPU PLL found on few Qualcomm
platforms.

Signed-off-by: Sivaprakash Murugesan <sivaprak@codeaurora.org>
Link: https://lkml.kernel.org/r/1588573803-3823-1-git-send-email-sivaprak@codeaurora.org


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