dt-bindings: tas2562: Add device specification links

Add device specification links for the TAS2562 and TAS2563.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200817172151.26564-2-dmurphy@ti.com


Signed-off-by: Mark Brown <broonie@kernel.org>