Revert "msm: pci: Update VREG info fron DT"

This reverts commit facf1631.
The logic for parsing cofiguration for vregs for
PCIe is already present in msm_pcie_get_resources. Hence this
change is not required.

Change-Id: I2b60b75573dc98b1d5cd45a630f0234e4eeae4e4
Signed-off-by: Mrinmay Sarkar <msarkar@codeaurora.org>