PCI: qcom: add missing supplies required for msm8996

This patch adds supplies that are required for msm8996. Two of them vdda
and vdda-1p8 are analog supplies that go in to controller, and the rest
of the two vddpe's are supplies to PCIe endpoints.

Without these supplies PCIe endpoints which require power supplies are
not enumerated at all, as there is no one to power it up.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>