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ena: Use atomic_load/store functions for first_interrupt variable

Surround cases of possible simultaneous access to the first_interrupt
variable with atomic_load/store functions.

Obtained from: Semihalf
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

(cherry picked from commit 0ac122c388d9a5e189e60378f1950b82a22bbdd1)

Git Hash:   b423f9fd210a0bd337de2219ac5d4f24c3ce789c
Git Author: dgr@semihalf.com
END