FreeBSD/src 4323355 (r320390)sys/geom/part g_part.c

With r318394 seems it breaks gpart(8) in some embedded systems such like PCEngines,
RPI1-B, Alix and APU2 boards as well as NanoBSD with the following message:

vnode_pager_generic_getpages_done: I/O read error 5

Seems the breakage was because it was missed to include acr in glabel update.

Reported by:    Peter Blok <pblok at bsd4all.org>,
                madpilot, imp and trasz.
Reviewed by:    trasz
Tested by:      Peter Blok and madpilot.
MFC after:      3 days.
Sponsored by:   iXsystems, Inc.
Differential Revision:  https://reviews.freebsd.org/D11365
DeltaFile
+2-1sys/geom/part/g_part.c
+2-11 files

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