arm64: dts: qcom: sdm845: Rename camss vdda-supply to vdda-phy-supply

The dts entry vdda-supply connects to a common vdda-phy-supply rail. Rename
to reflect what the functionality is.

Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>