FMUv5: Fix safety switch led

Both IO and FMU are connected to the safety switch for default models. This needs later to be broken out to a config option for builds that do not contain an IO.

src/drivers/boards/px4fmu-v5/board_config.h

@@ -548,7 +548,11 @@
 
 #define GPIO_RSSI_IN                       /* PB0  */ (GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN0)
 #define GPIO_RSSI_IN_INIT                  /* PB0  */ 0 /* Leave as ADC RSSI_IN */
-#define GPIO_nSAFETY_SWITCH_LED_OUT        /* PE12 */ (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN12)
+/* Change GPIO_nSAFETY_SWITCH_LED_OUT to
+ * (GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN12)
+ * to enable the safety switch led on FMU
+ */
+#define GPIO_nSAFETY_SWITCH_LED_OUT        /* PE12 */ (GPIO_INPUT|GPIO_FLOAT|GPIO_PORTE|GPIO_PIN12)
 #define GPIO_nSAFETY_SWITCH_LED_OUT_INIT   /* PE12 */ (GPIO_INPUT|GPIO_FLOAT|GPIO_PORTE|GPIO_PIN12)
 #define GPIO_SAFETY_SWITCH_IN              /* PE10 */ (GPIO_INPUT|GPIO_PULLUP|GPIO_PORTE|GPIO_PIN10)