usb: dwc3: debug: decode a few more features

We were missing U1, U2 and LTM Enable features. Let's decode them.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/debug.h

@@ -247,6 +247,15 @@ static inline void dwc3_decode_set_clear_feature(__u8 t, __u8 b, __u16 v,
 				case USB_DEVICE_TEST_MODE:
 					s = "Test Mode";
 					break;
+				case USB_DEVICE_U1_ENABLE:
+					s = "U1 Enable";
+					break;
+				case USB_DEVICE_U2_ENABLE:
+					s = "U2 Enable";
+					break;
+				case USB_DEVICE_LTM_ENABLE:
+					s = "LTM Enable";
+					break;
 				default:
 					s = "UNKNOWN";
 				} s; }),