Revert "Add support for chromecast hack"

This reverts commit 75f7f98f9efbff4aaddf11f83d01a4924e2eaa15.

Change-Id: I93a2cb205f6d96d149bbace3b7298fa301828bd7
Add audio.r_submix.default for casting

Change-Id: Ia4c0022881b1850d85459a7117e71b8048a0a55b