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
diff --git a/post_proc/virtualizer.c b/post_proc/virtualizer.c
index 2f0ca6b..e9eb728 100644
--- a/post_proc/virtualizer.c
+++ b/post_proc/virtualizer.c
@@ -237,6 +237,11 @@
 
     ALOGV("%s", __func__);
     virt_ctxt->ctl = output->ctl;
+    if (offload_virtualizer_get_enable_flag(&(virt_ctxt->offload_virt)))
+        if (virt_ctxt->ctl)
+            offload_virtualizer_send_params(virt_ctxt->ctl, virt_ctxt->offload_virt,
+                                          OFFLOAD_SEND_VIRTUALIZER_ENABLE_FLAG |
+                                          OFFLOAD_SEND_VIRTUALIZER_STRENGTH);
     return 0;
 }