usb: dwc3: make maximum-speed a per-instance attribute

in order to allow different instances of the
core work in different maximum speeds, we will
move the maximum_speed module_parameter to
both DeviceTree (making use the new maximum-speed
DT property) and platform_data.

Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/platform_data.h

@@ -17,6 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/usb/ch9.h>
+
 struct dwc3_platform_data {
+	enum usb_device_speed maximum_speed;
 	bool tx_fifo_resize;
 };