pinctrl: Ingenic: Add SSI pins support for JZ4755 and JZ4760.

Add SSI pins support for the JZ4755 SoC and the
JZ4760 SoC from Ingenic.
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Link: https://lore.kernel.org/r/1627108604-91304-3-git-send-email-zhouyanjie@wanyeetech.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>