fix PARAM_PREFIX for boards with px4io (CONFIG_BOARD_IO)

src/drivers/pwm_out/CMakeLists.txt

@@ -30,10 +30,18 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 ############################################################################
+
+set(PARAM_PREFIX PWM_MAIN)
+
+if(CONFIG_BOARD_IO)
+	set(PARAM_PREFIX PWM_AUX)
+endif()
+
 px4_add_module(
 	MODULE drivers__pwm_out
 	MAIN pwm_out
 	COMPILE_FLAGS
+		-DPARAM_PREFIX="${PARAM_PREFIX}"
 	SRCS
 		PWMOut.cpp
 		PWMOut.hpp

src/drivers/pwm_out/PWMOut.hpp

@@ -129,11 +129,6 @@ private:
 
 	static const int MAX_PER_INSTANCE{8};
 
-#ifdef BOARD_WITH_IO
-# define PARAM_PREFIX "PWM_AUX"
-#else
-# define PARAM_PREFIX "PWM_MAIN"
-#endif
 	MixingOutput _mixing_output {PARAM_PREFIX, FMU_MAX_ACTUATORS, *this, MixingOutput::SchedulingPolicy::Auto, true};
 
 	uint32_t	_backup_schedule_interval_us{1_s};