Add a struct pcie_host_ops .get_msi_data() method for platforms to return
their special MSI message data.
Signed-off-by: NMinghuan Lian <Minghuan.Lian@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NMohit KUMAR <mohit.kumar@st.com>