Merge branch 'pci/controller/qcom'

- Export DWC MSI controller related APIs for use by upcoming DWC-based ECAM
  implementation (Mayank Rana)

- Rename gen_pci_init() to pci_host_common_ecam_create() and export for use
  by controller drivers (Mayank Rana)

- Add DT binding and driver support for SA8255p, which supports ECAM for
  Configuration Space access (Mayank Rana)

- Update DT binding and driver to describe PHYs and per-Root Port resets in
  a Root Port stanza and deprecate describing them in the host bridge; this
  makes it possible to support multiple Root Ports in the future (Krishna
  Chaitanya Chundru)

* pci/controller/qcom:
  PCI: qcom: Add support for parsing the new Root Port binding
  dt-bindings: PCI: qcom: Move PHY & reset GPIO to Root Port node
  PCI: qcom: Add support for Qualcomm SA8255p based PCIe Root Complex
  dt-bindings: PCI: qcom,pcie-sa8255p: Document ECAM compliant PCIe root complex
  PCI: host-generic: Rename and export gen_pci_init() for PCIe controller drivers
  PCI: dwc: Export DWC MSI controller related APIs