FreeBSD_HEAD_arm64 - Build #3211 - Fixed

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FreeBSD_HEAD_arm64 - Build #3211 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/3211/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/3211/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_arm64/3211/console

Change summaries:

300619 by bz:
Try to unbreak the build after r300611 by including the header
defining VM_MIN_KERNEL_ADDRESS.

Sponsored by:	DARPA/AFRL

300618 by br:
Add initial DTrace support for RISC-V.

Sponsored by:	DARPA, AFRL
Sponsored by:	HEIF5

300617 by br:
Set dependencies for genassym.c.
This fixes non-parallel build.