AirModeYaw - Change airmode type from bool to int

src/drivers/linux_pwm_out/linux_pwm_out.cpp

src/drivers/pwm_out_sim/PWMSim.cpp

src/drivers/pwm_out_sim/PWMSim.hpp

src/drivers/px4fmu/fmu.cpp

src/drivers/snapdragon_pwm_out/snapdragon_pwm_out.cpp

src/drivers/uavcan/uavcan_main.cpp

src/drivers/uavcan/uavcan_main.hpp

src/lib/mixer/mixer.h

src/lib/mixer/mixer_group.cpp

src/lib/mixer/mixer_multirotor.cpp

src/modules/mc_att_control/mc_att_control_params.c

src/modules/px4iofirmware/protocol.h