arm64: dts: qcom: msm8998: Provide XO to RPMCC

The RPMCC node should be fed a reference to the XO fixed clock.
Do so.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://lore.kernel.org/r/20230627-topic-98_rpmcc-v1-1-4024e43ad0fc@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>