Bluetooth: Move out `BT_ASSERT` of `common/log.h`

Macro that was defined in the `common/log.h` has been moved to the newly
created `common/assert.h` file.

Files that were using those macro has been updated consequently. Also, the
include of `common/log.h` has been removed of files that were actually not
using any logging methods.

Some `#include "common/log.h"` have been removed. Those were required
before when including `hal/debug.h`. With this change, `hal/debug.h` no
longer has this requirement, because the replacement, `common/assert.h`
includes what it uses.

Signed-off-by: Théo Battrel <theo.battrel@nordicsemi.no>