mixer node: do not use macros
mixer node: do not use macros

This is not a portable module (ros only). Hence use the native ros
types.

jlecoeur/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,dagar/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,PX4/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,Aerotenna/Firmware,dagar/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,darknight-007/Firmware,PX4/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,darknight-007/Firmware,darknight-007/Firmware,PX4/Firmware,jlecoeur/Firmware,dagar/Firmware,acfloria/Firmware,jlecoeur/Firmware,dagar/Firmware,dagar/Firmware,jlecoeur/Firmware,acfloria/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,darknight-007/Firmware,darknight-007/Firmware,PX4/Firmware,PX4/Firmware,Aerotenna/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,krbeverx/Firmware,PX4/Firmware,Aerotenna/Firmware,krbeverx/Firmware,dagar/Firmware