Add support for HW8
- Allow SqueezeOS FW to be installed on HW8
- Include msp430 FW for HW8 supporting new rotary decoder (volume)
- Force facory reset when coming from SqueezeOS FW 10.x.x (Smart Radio to Squeezebox Radio migration)

Change-Id: I37927a12d09964d7ae1ca44f1fdbf066ee2d2447