arm64: dts: qcom: ipq8074: add A53 PLL node

Add the required node for A53 PLL which will be used to provide the CPU
clock via APCS for APSS scaling.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220818220628.339366-9-robimarko@gmail.com