arm64: dts: qcom: sm8550: fix xo clock source in cpufreq-hw node

Currently, available frequencies for all CPUs are appearing as 2x
of the actual frequencies. Use xo clock source as bi_tcxo in the
cpufreq-hw node to fix this.

Signed-off-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
Tested-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117093533.3710000-1-quic_pkondeti@quicinc.com