Because casting to and from "enum dsp_id" just adds noise, change everything to unsigned int. Change-Id: I52a7ae55f406e673d5b811b29657fcdc4b62ab10
Makes dsp_sample_input.c a bit less messy, and dependencies are more explicit. There's possibly a minor loss of inlining but it isn't a big deal. Change-Id: I30f923a0ca758f2b113d32852d1f65586dff0cd1