RC_Channel: remove use of never-set AP_HAL_PX4 and AP_HAL_VRBRAIN

libraries/RC_Channel/examples/RC_Channel/RC_Channel.cpp

@@ -7,7 +7,7 @@
 #include <RC_Channel/RC_Channel.h>
 
 // we need a boardconfig created so that the io processor is available
-#if HAL_WITH_IO_MCU || CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
+#if HAL_WITH_IO_MCU
 #include <AP_BoardConfig/AP_BoardConfig.h>
 #include <AP_IOMCU/AP_IOMCU.h>
 AP_BoardConfig BoardConfig;
@@ -58,7 +58,7 @@ void setup()
 {
     hal.console->printf("ArduPilot RC Channel test\n");
 
-#if HAL_WITH_IO_MCU || CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
+#if HAL_WITH_IO_MCU
     BoardConfig.init();
 #endif