Emmanuel Vadot 78442297f5 Add pmap_mapdev_attr for arm64
This is needed for efifb.
arm and ricv pmap (the two arch with arm64 that uses subr_devmap) have very
different implementation so for now only add this for arm64.

Tested with efifb on Pine64 with a few other patches.

Reviewed by:	cognet
Differential Revision:	https://reviews.freebsd.org/D15294
2018-06-20 16:07:35 +00:00
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