FreeBSD_HEAD_arm64 - Build #782 - Fixed

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FreeBSD_HEAD_arm64 - Build #782 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/782/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/782/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/782/console

Change summaries:

286367 by ngie:
Make some debug printf's into DPRINTF's to reduce noise on attach/detach

Differential Revision: https://reviews.freebsd.org/D3306
MFC after: 1 week
Reviewed by: loos
Sponsored by: EMC / Isilon Storage Division

286366 by andrew:
Fill in dump_avail based on the physical memory from EFI.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation

286364 by gjb:
Fix a typo.

Submitted by:	pkelsey
Sponsored by:	The FreeBSD Foundation

286363 by glebius:
Make it compilable. No idea if it works.