Rename struct mc_port to mc_pcie to match the convention of <driver>_pcie.
No functional change intended.

Link: https://lore.kernel.org/r/20211223011054.1227810-16-helgaas@kernel.orgSigned-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Daire McNamara <daire.mcnamara@microchip.com>