Revert "HID: Improve Windows Precision Touchpad detection."

This reverts commit cef457f.

Reason to revert:
  patch already backported into 4.19 as 51ade3d
  (upstream: 2dbc6f1)

drivers/hid/hid-core.c

@@ -741,10 +741,6 @@ static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage)
  if (usage == 0xff0000c5 && parser->global.report_count == 256 &&
  parser->global.report_size == 8)
  parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8;
-
- if (usage == 0xff0000c6 && parser->global.report_count == 1 &&
- parser->global.report_size == 8)
- parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8;
 }
 
 static void hid_scan_collection(struct hid_parser *parser, unsigned type)