dt-bindings: reset: convert nxp,lpc1850-rgu.txt to yaml format

Convert nxp,lpc1850-rgu.txt to yaml format.

Additional changes:
- remove label in example.
- remove reset consumer in example.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250602144046.943982-1-Frank.Li@nxp.com


Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>