ARM: dts: qcom: msm8226: Use XO from rpmcc where possible

The xo clock being used everywhere actually goes via the RPM. Since the
rpmcc driver recently got support for this clock we can use this now.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230509-msm8226-mmcc-parents-v1-1-83a2dfc986ab@z3ntu.xyz