A2dpSrc: Use correct API to send passthrough command for PTS.

After refactoring of avrcpcontroller as part of AOSP, need to use
the correct API to send passthrough command in case of PTS.

CRs-Fixed: 2474873
Change-Id: Ie5a3f9629fd25c3747c8d88f87fd6ca0f6b1144b
1 file changed