Switch zfsboot installer force 4K option to use vfs.zfs.min_auto_ashift=12

Previously we used gnop(8) to fake 4K sector size disks but ZFS now has a
sysctl to control this when creating new top level vdev's so use that
instead.

Differential Revision:	D566
MFC after:	1 month
Sponsored by:	Multiplay


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276027 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Further reduce the diff between the arm_intrng gic driver and the version
in head.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276028 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f