core: pci: Rework config space header write moderation

core: pci: Rework config space header write moderation

Switch to a more powerful array-based write access control for the PCI
config space header. The array consists of tuples, each controlling the
access to one dword row. Access can be denied, permitted or emulated as
read-only, thus ignored. As before, a mask selects the bytes of the row
for which the access type applies.

This new model allows to properly describe which registers of the bridge
header we effectively want to freeze as read-only so that Linux can
rescan buses.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>