ROMFS move airframes to subdirectory

ROMFS/px4fmu_common/init.d/CMakeLists.txt

ROMFS/px4fmu_common/init.d/airframes/1000_rc_fw_easystar.hil

ROMFS/px4fmu_common/init.d/airframes/10015_tbs_discovery

ROMFS/px4fmu_common/init.d/airframes/10016_3dr_iris

ROMFS/px4fmu_common/init.d/airframes/10017_steadidrone_qu4d

ROMFS/px4fmu_common/init.d/airframes/10018_tbs_endurance

ROMFS/px4fmu_common/init.d/airframes/1001_rc_quad_x.hil

ROMFS/px4fmu_common/init.d/airframes/1002_standard_vtol.hil

ROMFS/px4fmu_common/init.d/airframes/11001_hexa_cox

ROMFS/px4fmu_common/init.d/airframes/12001_octo_cox

...S/px4fmu_common/init.d/airframes/12002_steadidrone_mavrik

...x4fmu_common/init.d/airframes/13000_generic_vtol_standard

ROMFS/px4fmu_common/init.d/airframes/13001_caipirinha_vtol

ROMFS/px4fmu_common/init.d/airframes/13002_firefly6

ROMFS/px4fmu_common/init.d/airframes/13003_quad_tailsitter

ROMFS/px4fmu_common/init.d/airframes/13004_quad+_tailsitter

ROMFS/px4fmu_common/init.d/airframes/13005_vtol_AAERT_quad

.../px4fmu_common/init.d/airframes/13006_vtol_standard_delta

ROMFS/px4fmu_common/init.d/airframes/13007_vtol_AAVVT_quad

ROMFS/px4fmu_common/init.d/airframes/13008_QuadRanger