dt-bindings: usb: chipidea,usb2-imx: move imx parts to dedicated schema

dt-bindings: usb: chipidea,usb2-imx: move imx parts to dedicated schema

As more and more NXP i.MX chips come out, it becomes harder to maintain
ci-hdrc-usb2.yaml if more stuffs like property restrictions are added to
this file. This will separate i.MX parts out of ci-hdrc-usb2.yaml and add
a new schema for NXP ChipIdea USB2 Controller, also add a common schema.

1. Copy common ci-hdrc-usb2.yaml properties to a new shared
   chipidea,usb2-common.yaml schema.
2. Move fsl,* compatible devices and imx spefific properties
   to dedicated binding file chipidea,usb2-imx.yaml.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240321081439.541799-4-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>