dt-bindings: reset: aoss: Convert AOSS reset bindings to yaml

Convert AOSS reset bindings to yaml and add SC7180 AOSS reset to the list
of possible bindings.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>