dt-bindings: clock: Add X1830 clock bindings.

Add the clock bindings for the X1830 Soc from Ingenic.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/20200528031549.13846-5-zhouyanjie@wanyeetech.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>