arm64: dts: qcom: sdm630: rename qusb2phy to qusb2phy0

In preparation to adding second USB host/PHY pair, change first USB
PHY's label to qusb2phy0.

Suggested-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220521202708.1509308-6-dmitry.baryshkov@linaro.org