px4fmu-v4pro board_config: swap BRICK1 with BRICK2

problem: previously when connecting power to Power 1, commander refused
to arm (no power source error), and when connecting to Power 2, arming
works, but power consumption was not measured (& shown in QGC).
Swapping Brick1 with Brick2 makes sure both works when connecting to
power 1.

Ideally we will have support for both power sources (including fail-over)

src/drivers/boards/px4fmu-v4pro/board_config.h

@@ -233,8 +233,8 @@ __BEGIN_DECLS
 #define GPIO_GPIO5_OUTPUT	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTD|GPIO_PIN14)
 
 /* Power supply control and monitoring GPIOs */
-#define GPIO_VDD_BRICK_VALID	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN5)
-#define GPIO_VDD_BRICK2_VALID	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTG|GPIO_PIN5)
+#define GPIO_VDD_BRICK_VALID	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTG|GPIO_PIN5)
+#define GPIO_VDD_BRICK2_VALID	(GPIO_INPUT|GPIO_PULLUP|GPIO_PORTB|GPIO_PIN5)
 #define GPIO_VDD_3V3_SENSORS_EN	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTE|GPIO_PIN3)
 #define GPIO_VDD_3V3_PERIPH_EN	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_SET|GPIO_PORTC|GPIO_PIN5)
 #define GPIO_VDD_5V_PERIPH_EN	(GPIO_OUTPUT|GPIO_PUSHPULL|GPIO_SPEED_2MHz|GPIO_OUTPUT_CLEAR|GPIO_PORTG|GPIO_PIN10)
@@ -355,8 +355,8 @@ __BEGIN_DECLS
 #define GPIO_3V3_SENSORS_EN    (1<<6)  /**< PE3  - GPIO_VDD_3V3_SENSORS_EN */
 #define GPIO_3V3_PERIPH_EN     (1<<7)  /**< PC5  - GPIO_VDD_3V3_PERIPH_EN  */
 
-#define GPIO_BRICK_VALID       (1<<8)  /**< PB5  - !GPIO_VDD_BRICK_VALID */
-#define GPIO_BRICK2_VALID      (1<<9)  /**< PG5  - !GPIO_VDD_BRICK2_VALID */
+#define GPIO_BRICK_VALID       (1<<8)  /**< PG5  - !GPIO_VDD_BRICK_VALID */
+#define GPIO_BRICK2_VALID      (1<<9)  /**< PB5  - !GPIO_VDD_BRICK2_VALID */
 #define GPIO_USB_VBUS_VALID    (1<<10) /**< PC0  - !GPIO_VBUS_VALID */
 
 #define GPIO_5V_HIPOWER_OC     (1<<11) /**< PF3  - !GPIO_VDD_5V_RC_OC */