kakutef7 board_config: remove usb valid defines

Otherwise 'system_power' gets published with voltage5v_v = 0, as there is
no 5V sensing pin, leading to Avionics Power Low preflight check failures.

boards/holybro/kakutef7/src/board_config.h

@@ -189,21 +189,6 @@
 
 #define GPIO_RSSI_IN                       /* PC5  */ (GPIO_INPUT|GPIO_PULLUP|GPIO_PORTC|GPIO_PIN5)
 
-/* By Providing BOARD_ADC_USB_CONNECTED (using the px4_arch abstraction)
- * this board support the ADC system_power interface, and therefore
- * provides the true logic GPIO BOARD_ADC_xxxx macros.
- */
-#define BOARD_ADC_USB_CONNECTED (px4_arch_gpioread(GPIO_OTGFS_VBUS))
-
-#if BOARD_HAS_USB_VALID == 1
-#  define BOARD_ADC_USB_VALID     (!px4_arch_gpioread(GPIO_nVDD_USB_VALID))
-#else
-#  define BOARD_ADC_USB_VALID     BOARD_ADC_USB_CONNECTED
-#endif
-
-#define BOARD_ADC_SERVO_VALID     (1)
-#define BOARD_ADC_BRICK1_VALID  (1)
-
 #define BOARD_HAS_PWM  DIRECT_PWM_OUTPUT_CHANNELS
 
 /* This board provides a DMA pool and APIs */