arm64: dts: qcom: pm8150: use qcom,pm8998-pon binding

Change pm8150 to use the qcom,pm8998-pon compatible string for the pon
in order to pass reboot mode properly.

Fixes: 5101f22a

 ("arm64: dts: qcom: pm8150: Add base dts file")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Tested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210916151341.1797512-1-dmitry.baryshkov@linaro.org