dt-bindings: reset: snps,axs10x-reset: Convert to yaml

Convert the device tree bindings for the AXS10x reset controller to YAML
schema to allow participating in DT validation.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220407154338.4190674-8-p.zabel@pengutronix.de