Lower the RPM limit for production test driver

RPM looks like its always above 11000 but lets have some buffer.
If we see it is consistently above we might want to increase

src/deck/drivers/src/test/exptestCfBl.c

@@ -70,7 +70,7 @@
 
 #define ET_NBR_PINS         7
 
-#define RPM_TEST_LOWER_LIMIT 12000
+#define RPM_TEST_LOWER_LIMIT 10500
 #define MOTOR_TEST_PWM (UINT16_MAX/2)
 #define MOTOR_TEST_TIME_MILLIS 2000
 #define MOTOR_FEED_SIGNAL_INTVL 1
@@ -191,6 +191,9 @@ static bool rpmTestRun(void)
     DEBUG_PRINT("Motor; %d RPM; %d\n", i, rpmAvg);
     passed &= (rpmAvg > RPM_TEST_LOWER_LIMIT);
   }
+  if (!passed) {
+    DEBUG_PRINT("RPM test failed, lower limit is set to; %d\n", RPM_TEST_LOWER_LIMIT);
+  }
   return passed;
 }