oe-selftest: fitimage: test external dtb

There are several ways to insert external devicetrees and devicetree
overlays into the kernel and thus at least to some extent into the FIT
image.
So far there is no test coverage. Let's improve this as much as possible
without fully understanding all use cases.

This first test adds a devicetree overlay to a build configuration
without signing, since signing is apparently not yet meaningful when
PREFERRED_PROVIDER_virtual/dtb = “bborg-relay-00a2” is used. It is also
not entirely clear how these external devicetree overlays are used by
the configuration nodes of the FIT image. Currently, one configuration
is created per dtb dtbo node, which is not really useful for dtbo nodes.
Before this test can be extended to test devicetree overlays and
signing, the code that creates the configuration nodes in its file
probably needs some improvements in terms of more flexibility in
defining the references from configuration nodes to image nodes.

(From OE-Core rev: 3442d9297dcab400dfe8db93790e049778e0abdb)

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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