arm64: dts: qcom: Drop reg-names from QMP PHY nodes

The 'reg-names' is not a supported/used property.  Drop it from QMP PHY
nodes to fix dtbs_check warnings like below.

phy-wrapper@88e9000: 'reg-names' does not match any of the regexes: '^phy@[0-9a-f]+$', 'pinctrl-[0-9]+'
        arch/arm64/boot/dts/qcom/sm8350-hdk.dt.yaml
        arch/arm64/boot/dts/qcom/sm8350-mtp.dt.yaml

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210929034253.24570-7-shawn.guo@linaro.org