Re: dtc: Make -Idts -Odts preserve node/property labels

So, like, the other day David Gibson mumbled:

This patch changes -Odts mode output so that labels on properties,
nodes and memreserve entries in input source are preserved in the
output.

Preserving labels within property values is trickier - another patch
coming later.

Signed-off-by: David Gibson <redacted>

Applied.

jdl