ice(4): Restore old conditional overwritten by last update

Commit 8923de590543 ("ice(4): Update to 1.37.7-k", 2023-02-13)
unintentionally overwrote the change made in commit 52f45d8acee9 ("net:
iflib: let the drivers use isc_capenable", 2021-12-28).

Signed-off-by: Eric Joyner <erj@FreeBSD.org>

Reported by: jhibbits@
MFC after: 3 days
Sponsored by: Intel Corporation