arm64: dts: qcom: sdm845: Add camss vdda-pll-supply

Add in the missing vdda-pll-supply rail description.

Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220111125212.2343184-5-bryan.odonoghue@linaro.org