Some SoCs (such as Amlogic Meson GXL for example) share the reset line
with other components (in case of the Meson GXL example there's a shared
reset line between the USB2 PHYs, USB3 PHYs and the dwc3 controller).
Additionally SoC implementations may prefer a reset pulse over level
resets.

For now this falls back to the old defaults, which are:
- reset lines are exclusive
- level resets are being used
Signed-off-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Tested-by: NYixun Lan <yixun.lan@amlogic.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>