AP_BattMonitor: remove checks for HAL_BOARD_APM2 and HAL_BOARD_APM1

libraries/AP_BattMonitor/AP_BattMonitor_Analog.h

@@ -8,17 +8,7 @@
 #include "AP_BattMonitor_Backend.h"
 
 // default pins and dividers
-#if CONFIG_HAL_BOARD == HAL_BOARD_APM1
- # define AP_BATT_VOLT_PIN                  0       // Battery voltage on A0
- # define AP_BATT_CURR_PIN                  1       // Battery current on A1
- # define AP_BATT_VOLTDIVIDER_DEFAULT       3.56f   // on-board APM1 voltage divider with a 3.9kOhm resistor
- # define AP_BATT_CURR_AMP_PERVOLT_DEFAULT  0
-#elif CONFIG_HAL_BOARD == HAL_BOARD_APM2
- # define AP_BATT_VOLT_PIN                  13      // APM2.5/2.6 with 3dr power module
- # define AP_BATT_CURR_PIN                  12
- # define AP_BATT_VOLTDIVIDER_DEFAULT       10.1f
- # define AP_BATT_CURR_AMP_PERVOLT_DEFAULT  17.0f
-#elif CONFIG_HAL_BOARD == HAL_BOARD_FLYMAPLE
+#if CONFIG_HAL_BOARD == HAL_BOARD_FLYMAPLE
 // Flymaple board pin 20 is connected to the external battery supply
 // via a 24k/5.1k voltage divider. The schematic claims the divider is 25k/5k,
 // but the actual installed resistors are not so.