Move r_submix implementation into audio.service.ranchu

a.h.audio@6.0-impl and audio.r_submix.default
are a.h.audio.service.ranchu's dependencies and
vendor.mk does not have to know about them.

Bug: 157158109
Test: presubmit
Signed-off-by: Roman Kiryanov <rkir@google.com>
Change-Id: Ieadf3bf88ed04f76cf66b0e91b5a96a3b0e21615
Merged-In: Ieadf3bf88ed04f76cf66b0e91b5a96a3b0e21615
2 files changed