The internal storage of this device can get messed up by other operating
systems, so it's handy to be able to clear it.
I'm not 100% sure whether the commands I've sent to the device are
exactly what is supposed to be used (just a guess), but it did seem to
work, and it even fixed another issue I had.
It can be convenient for device users to check what it supports, without
having multiple functions to check each single feature.
So expose this and add tests.
there is no specific API for report finger status,
finger needed status is set when captrue sample cmd send, once cmd receive correct,
finger is pressing on sensor.
