etheriwl: add for Intel Wireless-AC 9260

the 9000 series uses a new receive descriptor format
wich appears to reqire 4k aligned buffers. the old
format "halfworks" and just makes the firmware not
respond to any commands after the enable paging command.

the smartfifo command appears to causes problems.
but apparently not issuing it at all seems to work
fine on both the 8265 and 9260. so removing the code
for now.

issuing the bindingquota command before associated
makes association impossible. but enabling afterwards
works fine. (tested in 8265 and 9260).

the prph access functions now mask the address with
0xfffff. it is unclear why linux and openbsd drivers
specify addresses beyond that in ther register constants.

the timeevent change is interesting. the timeevent
needs to be restarted when it has stoped to make sure
probing/association packets are sent during the evnet.

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