echoplayer: add echoplayer-specific codec header
Remove the generic TLV320AIC3104 codec header. The codec
is sufficiently complex that a one-size-fits-all driver
isn't really feasible, eg. due to different clocking and
output configurations.
It's easier for targets to have their own audio headers
tailored to their use case than a generic header with
lots of ifdefs.
Change-Id: I63d92d57c28ddd7da7aa3174bd583d8afb1aa56d