linux-imx

usb: dwc3: Add chip-specific compatible string

Some Layerscape paltforms (such as LS1088A, LS2088A, etc) require update HW
default cache type configuration to fix DWC3 init failure when applying
property dma-coherent.

Note that the cache type configuration is actually native feature of DWC3,
not additional desgin coming from SoC, so add this support here.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
Reviewed-by: Jun Li <jun.li@nxp.com>