Mesa hostmot2 soc leaves pins driven when closed

[the-snowwhite]

In the hm2_soc_ol mesa driver pins are left driven when the driver is exited.
This is unpractical if fx a pin is used to enable motor drivers as the hal itself has no exit function to run when the hal is closed.
So that when the hostmot driver is shut down via fx closing the hal, the motors are left in active state.