Revert "WE HAVE TO GO BACK, and revert this damn dsp_c0"

This reverts commit da412861b2e970074886e87fc7c97bb1c1ed70db.
Fix Custom Voltage.

TI turned dsp into dsp_c0. Let custom voltage be aware of this change.

Signed-off-by: Gianmarco Rengucci <rengucci.gianmarco@gmail.com>