Revert "Widen EPOCH(9) usage in PCI WLAN drivers."
This reverts commit b65f813c1ab99448278961c5ca80dc422b1eae29.
As a side effect this also seems to fix wtap which seems to have
lost the epoch over the input path in between.
Sponsored by: The FreeBSD Foundation
(cherry picked from commit 1c6dd33d26eb02c6145383a49150965eeca61120)