checks: Add 'dma-ranges' check

Generalize the existing 'ranges' check to also work for 'dma-ranges'
which has the same parsing requirements.

Signed-off-by: Rob Herring <robh@kernel.org>
Message-Id: <20200303193931.1653-1-robh@kernel.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>