MLK-16715-3 ARM64: dts: fsl-imx8qm: change USB2 controller properties

MLK-16715-3 ARM64: dts: fsl-imx8qm: change USB2 controller properties

The imx8qm's non-core register controller is more like imx7ulp than
imx7d, since imx7d uses Samsung PHY, but imx7ulp and imx8qm use
freescale PHY, so imx8qm uses the same compatible for imx7ulp.

But imx8qm and imx7ulp's platform are so many differences, so the
compatible for driver are different.

Besides, we add performance tuning parameters and delete properties which
is dedicated for imx7d.

Acked-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>