[gta02-core] More audio considerations

[Werner Almesberger]

?lvaro Lopes wrote:
> I wonder if, as last resort, we can put a NTC there. I am not sure such
> thing exists as SMT NTC however.

The PMU should be able to protect itself - there's a temperature
sensor with proper (i.e., cannot be overridden by software) shutdown
logic, as explained section 8.6 of the PMU manual.

I didn't torture-test it yet, though. Maybe tomorrow :)

- Werner