Improve tests for dtc overlay generation

So far, the tests for generating runtime overlays with dtc weren't checking
the syntactic sugar.  This adds such a test.

Furthermore the existing tests were only minimally testing dtc's output
for the overlay.  This adds a test comparing the dtc output with the
more or less manually constructed overlays we already have for testing
libfdt's overlay application code.  This does require some minor changes
to that manually constructed overlay which don't change the sematics but
re-order / rename things to match the way dtc does it.

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

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