ASoC: dt-bindings: rt5645: add suppliers

The rt5645 and rt5650 have two suppliers, document them.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Link: https://lore.kernel.org/r/20200114150151.8537-1-matthias.bgg@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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