Direct commit to stable/11 to correctly setting the EIAC and IMS
registers to the same values when processing interrupts. This reverts a
change made in r286831 that was not fully reverted in r311979

This resolves PR https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211219

PR: 211219
Submitted by: Franco Fitchner <franco@opnsense.org>
Approved by: re (marius)