dt-bindings: i3c: Fix silvaco,i3c-master-v1 compatible string

The example for the Silvaco I3C master doesn't match the schema's
compatible string. Fix it.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Conor Culhane <conor.culhane@silvaco.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: linux-i3c@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210311234056.1588751-1-robh@kernel.org