examples/px4_daemon_app: remove this app

cmake/configs/nuttx_aerocore2_default.cmake

cmake/configs/nuttx_auav-x21_default.cmake

cmake/configs/nuttx_crazyflie_default.cmake

cmake/configs/nuttx_mindpx-v2_default.cmake

cmake/configs/nuttx_nxphlite-v3_default.cmake

cmake/configs/nuttx_px4-same70xplained-v1_default.cmake

cmake/configs/nuttx_px4-stm32f4discovery_default.cmake

cmake/configs/nuttx_px4fmu-v2_default.cmake

cmake/configs/nuttx_px4fmu-v2_test.cmake

cmake/configs/nuttx_px4fmu-v3_default.cmake

cmake/configs/nuttx_px4fmu-v4_default.cmake

cmake/configs/nuttx_px4fmu-v4pro_default.cmake

cmake/configs/nuttx_px4fmu-v5_default.cmake

cmake/configs/nuttx_px4nucleoF767ZI-v1_default.cmake

cmake/configs/posix_sitl_default.cmake

src/examples/px4_daemon_app/CMakeLists.txt

src/examples/px4_daemon_app/px4_daemon_app.c