dt-bindings: i3c: silvaco: Add npcm845 compatible string

dt-bindings: i3c: silvaco: Add npcm845 compatible string

Nuvoton npcm845 SoC uses the same Silvico IP but an older version.
Need to add a new compatible string to distinguish between different
hardware versions.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Stanley Chu <yschu@nuvoton.com>
Link: https://lore.kernel.org/r/20250306075429.2265183-2-yschu@nuvoton.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>