ukbd: Enable ukbd_apple_swap for all Apple ISO keyboards

Key code swapping between [<>] and [^°] key is enabled for all Apple ISO
type keyboards. Before, swapping was enabled when the Eject key was
detected in HID usage. This did not correlate well with the swapped
keys presence.

usbdevs file is extended by several Apple keyboard models to support ISO
model identification.

Reviewed by: markj
MFC after: 2 weeks
Pull Request: https://github.com/freebsd/freebsd-src/pull/1506

(cherry picked from commit 541e7a98b762916cd951a64dd7e77efd51dfa8dc)