Cristiana Precup

### Pull Request Overview This pull request adds HIL and a system call driver for distance and a driver for HC-SR04 Distance Sensor. The files added for this capsules are:...

This pull request adds an app that provides a simple interface to read measurements from a connected distance sensor (https://github.com/tock/tock/pull/4138). Files added: `libtock_sync/sensors/distance.c` `libtock_sync/sensors/distance.h` `libtock/sensors/syscalls/distance_syscalls.c` `libtock/sensors/syscalls/distance_syscalls.h` `libtock/sensors/distance.c` `libtock/sensors/distance.h` File modified:...