soc: qcom: rpmhpd: sm8450: Add the missing .peer for sm8450_cx_ao

sm8450_cx and sm8450_cx_ao should be peers of each other, add the
missing .peer entry for sm8450_cx_ao

Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Rajendra Nayak <quic_rjendra@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1639063917-9011-2-git-send-email-quic_rjendra@quicinc.com