This compatibility string is used in .dts file of Armada38x
and isrequired for driver attachment.

Reviewed by:    andrew, ian, imp
Obtained from:  Semihalf
Sponsored by:   Stormshield
Submitted by:   Michal Stanek <mst@semihalf.com>
Differential revision:  https://reviews.freebsd.org/D4216