OvmfPkg: PlatformBdsLib: Dynamic PCI Interrupt Line register setup

Remove hard-coded list of PCI devices for which the Interrupt Line
register is initialized. Instead, provide a "visitor" function to
initialize the register only for present and applicable PCI devices.

At this time, we match the behavior of SeaBIOS (file src/fw/pciinit.c,
functions *_pci_slot_get_irq() and "map the interrupt" block from
pci_bios_init_device()).

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/OvmfPkg@16398 6f19259b-4bc3-4df7-8a09-765794883524