msm: pcie: add DRV SSR support during DRV resume

If the DRV subsystem goes through SSR (subsystem reset), then
PCIe root complex driver needs to handle recovering PCIe
controller and PHY accordingly.

Change-Id: I230e196725901acac29843b372aae5805a0763e7
Signed-off-by: Tony Truong <truong@codeaurora.org>