Pull up following revision(s) (requested by riastradh in ticket #653):

sys/dev/pci/if_iwn.c: revision 1.100

if_iwn.c: pick up proper firmware for Centrino Wireless-N 130

Both variants should use iwlwifi-6000g2b-6 not iwlwifi-6000g2a-6. (It
seems only two specific product variants use iwlwifi-6000g2a-6. We
could simplify by reversing the sense of the test, as OpenBSD does, but
it doesn't seem to matter much, as what we now match seems to be the
full gamut possible, so the simpler diff was chosen here.)

Addresses PR kern/58105 from wandrien.dev%gmail.com@localhost, with the
PCI_PRODUCT_INTEL_WIFI_LINK_130_1 match tested by the reporter. Code
inspection of the FreeBSD driver indicates we should safely be able to
match PCI_PRODUCT_INTEL_WIFI_LINK_130_2 also.

(martin)