delete examples mc_att_control_multiplatform

src/examples/mc_att_control_multiplatform/CMakeLists.txt

src/examples/mc_att_control_multiplatform/mc_att_control.cpp

src/examples/mc_att_control_multiplatform/mc_att_control.h

...ples/mc_att_control_multiplatform/mc_att_control_base.cpp

...amples/mc_att_control_multiplatform/mc_att_control_base.h

...ples/mc_att_control_multiplatform/mc_att_control_main.cpp

...ples/mc_att_control_multiplatform/mc_att_control_params.c

...ples/mc_att_control_multiplatform/mc_att_control_params.h

...mples/mc_att_control_multiplatform/mc_att_control_sim.cpp

...xamples/mc_att_control_multiplatform/mc_att_control_sim.h

..._att_control_multiplatform/mc_att_control_start_nuttx.cpp