Fix comparing L3 type with L4 enum on RX hash in ENA driver

This bug wasn't impacting anything, because both enums are indicating
the same value, but it could cause a problem on API change.

Submitted by: Michal Krawczyk <mk@semihalf.com>
Reviewed by: byenduri_gmail.com
Obtained from: Semihalf
Sponsored by: Amazon, Inc.
Differential Revision: https://reviews.freebsd.org/D12867