post_proc: Enable effects param in DSP to start effect

-During switch to tunnel playback, offload effects-flags remain
disabled. This stops effects being applied on tunnel playback.
-Send effects enable params to DSP to start effects during switch.

Change-Id: Ibe1e50b41ca25b51537e4a0ad80dbd5184379133
CRs-Fixed: 593509
3 files changed