dt-binding: can: mcp25xxfd: documentation fixes

dt-binding: can: mcp25xxfd: documentation fixes

Apply following fixes:
- Use 'interrupts'. (interrupts-extended will automagically be supported
  by the tools)
- *-supply is always a single item. So, drop maxItems=1
- add "additionalProperties: false" flag to detect unneeded properties.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20200923125301.27200-1-o.rempel@pengutronix.de
Reported-by: Rob Herring <robh@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Fixes: 2dffde966ad8 ("dt-binding: can: mcp25xxfd: document device tree bindings")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>