K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2018-01-23T18:03:13.170055Z
K 7
svn:log
V 617
stand/fdt: Fallback to `name` + ".dtbo" if we fail to load `name`

This behavior also matches a Linux-ism by allowing fdt_overlays to specify
names of overlays without an extension, e.g. fdt-overlays="sunxi-h3-h5-emac"

If we fail to load the file given by a name in fdt_overlays, try again with
".dtbo" appended to it. This still allows overlays to lack .dtbo extension
if user prefers it and just adds a fallback cushion.

Future work could move this from a hard-coded ".dtbo" to a loader.conf(5)
configuration option.

Reviewed by:	gonzo
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D13968

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