Revert "Revert "Reset CAN ign when the specific message is not seen a…

…nymore (commaai#1200)""

This reverts commit 0e48095.

board/drivers/can_common.h

@@ -195,24 +195,25 @@ void ignition_can_hook(CANPacket_t *to_push) {
   int addr = GET_ADDR(to_push);
   int len = GET_LEN(to_push);
 
-  ignition_can_cnt = 0U;  // reset counter
-
   if (bus == 0) {
     // GM exception
     if ((addr == 0x160) && (len == 5)) {
       // this message isn't all zeros when ignition is on
       ignition_can = GET_BYTES(to_push, 0, 4) != 0U;
+      ignition_can_cnt = 0U;
     }
 
     // Tesla exception
     if ((addr == 0x348) && (len == 8)) {
       // GTW_status
       ignition_can = (GET_BYTE(to_push, 0) & 0x1U) != 0U;
+      ignition_can_cnt = 0U;
     }
 
     // Mazda exception
     if ((addr == 0x9E) && (len == 8)) {
       ignition_can = (GET_BYTE(to_push, 0) >> 5) == 0x6U;
+      ignition_can_cnt = 0U;
     }
 
   }