audio: correct the init mixer path for incall record

We use Multimedia8 and Multimedia9 for incall record

Bug: 140384450
Test: build pass. automatic call screen function test
Change-Id: I6e84cd68e23b3ac2736dbf3b3eeb7afcaf87bf70
Signed-off-by: JJ Lee <leejj@google.com>
1 file changed