boards/ delete unused stm32 nucleo-F767ZI example

.ci/Jenkinsfile-compile

Makefile

boards/stm/nucleo-F767ZI/default.cmake

boards/stm/nucleo-F767ZI/firmware.prototype

boards/stm/nucleo-F767ZI/nuttx-config/include/board.h

boards/stm/nucleo-F767ZI/nuttx-config/nsh/defconfig

boards/stm/nucleo-F767ZI/nuttx-config/scripts/ld.script

boards/stm/nucleo-F767ZI/src/CMakeLists.txt

boards/stm/nucleo-F767ZI/src/board_config.h

boards/stm/nucleo-F767ZI/src/can.c

boards/stm/nucleo-F767ZI/src/init.c

boards/stm/nucleo-F767ZI/src/led.c

boards/stm/nucleo-F767ZI/src/sdio.c

boards/stm/nucleo-F767ZI/src/spi.c

boards/stm/nucleo-F767ZI/src/timer_config.c

boards/stm/nucleo-F767ZI/src/usb.c