spi: Add bindings for new Ingenic SoCs.

Add the SPI bindings for the JZ4775 SoC, the X1000 SoC,
and the X2000 SoC from Ingenic.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/1650724725-93758-3-git-send-email-zhouyanjie@wanyeetech.com


Signed-off-by: Mark Brown <broonie@kernel.org>