Makefile: Fix missing params by searching one level deeper
Makefile: Fix missing params by searching one level deeper

This is required for generating documentation

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