MFC r341406, r342106

r341406:
Fix PCI driver unload for Marvell PCI controller

Add generic implementation for bus_deactivate_resource method. Without
it bus_release_resource fails with "Failed to release active resource"
message

r342106:
[mv_pci] Do not attempt to attach disabled PCI ports

Fail probe for PCI port if the respective FDT node is not enabled

Differential Revision: https://reviews.freebsd.org/D18385