rcS: set MIXER_AUX to mount if vmount enabled and output is AUX
rcS: set MIXER_AUX to mount if vmount enabled and output is AUX

This automatically selects the mount aux mixer if mount is enabled via
parameters. A user can customize this by adding a file
 etc/mixers/mount.aux.mix
to the SD card.

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