tests: Better testing of dtc -I fs mode

Greg Kurz added a trivial test of the -I fs mode recently, which was
previously basically untested.  This is an oversight, since we
recently had a bug which completely broke it.

This replaces Greg's test with a more thorough test of -I fs mode.  We
use a test helper to create the familiar test_tree1 in "fs" form, then use
dtc -I fs to process it, and check that the results match what they
should.

We only check the content in -I fs -O dtb mode, since that's simplest,
but we do run -I fs -O dts mode as well to make sure it doesn't blow
up (the aforementioned bug caused just such a blow up, specific to -O
dts mode, for example).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

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