Add counter device to udev rules

Author: Tiryoh

50-rtmouse.rules

@@ -3,3 +3,4 @@ KERNEL=="rtlightsensor*",ACTION=="add",MODE="0666"
 KERNEL=="rtbuzzer*",ACTION=="add",MODE="0666"
 KERNEL=="rtswitch*",ACTION=="add",MODE="0666"
 KERNEL=="rtled*",ACTION=="add",MODE="0666"
+KERNEL=="rtcounter*",ACTION=="add",MODE="0666"