K 10
svn:author
V 4
manu
K 8
svn:date
V 27
2019-04-17T20:09:01.600803Z
K 7
svn:log
V 392
ofw_graph: Add functions for graph bindings

Those functions are helpers to work on graph bindings.
graphs are mostly use with video related devices.
See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/graph.txt?id=4436a3711e3249840e0679e92d3c951bcaf25515

MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D19877

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