Pullup

sys/dev/pci/pcireg.h            1.74-1.82 and 1.84 via patch
sys/dev/pci/pci_subr.c          1.92-1.102, 1.104-1.105 via patch

	Add some PCI(e) register and bit definitions in pcireg.h.
	Fix the definition of PCI_PCIE_SLCAP_PSN.
	Fix a bug that IRQ(MSI) bits in PCIe capability register is incorrectly
	decoded.
	Print more registers in "pcictl dump".
	Fix bug in comment.

Requested by msaitoh in ticket #928