K 10
svn:author
V 4
manu
K 8
svn:date
V 27
2018-06-20T16:07:35.306415Z
K 7
svn:log
V 329
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

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