Revert "Change BFL driver thread initialising to a constant 100ms delay between devices instead of a random arrangement."

This reverts commit 0785886b53.

driver-bitforce.c

@@ -495,9 +495,9 @@ static bool bitforce_thread_init(struct thr_info *thr)
 	struct cgpu_info *bitforce = thr->cgpu;
 	unsigned int wait;
 
-	/* Pause each new thread at least 100ms between initialising
-	 * so the devices aren't making calls all at the same time. */
-	wait = thr->id * MAX_START_DELAY_US;
+	/* Pause each new thread a random time between 0-100ms 
+	so the devices aren't making calls all at the same time. */
+	wait = (rand() * MAX_START_DELAY_US)/RAND_MAX;
 	applog(LOG_DEBUG, "BFL%i: Delaying start by %dms", bitforce->device_id, wait / 1000);
 	usleep(wait);