dt-bindings: serial: 8250: Add npcm845 compatible string

Add a compatible string for Nuvoton BMC NPCM845 UART.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220630103606.83261-3-tmaimon77@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>