arm64: dts: qcom: sm8250: Update the RPMHPD bindings entry

Update the RPMHPD bindings entry as per the new generic bindings defined in
rpmhpd.h for SM8250 SoC.
Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Link: https://lore.kernel.org/r/1689840545-5094-2-git-send-email-quic_rohiagar@quicinc.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>