SpdifStreamOut: Support AUDIO_FORMAT_E_AC3_JOC

Test: build
Change-Id: Iac3dc90e136d625ecbd95eea5c2eea13fc938657
diff --git a/services/audioflinger/SpdifStreamOut.cpp b/services/audioflinger/SpdifStreamOut.cpp
index a44ab2a..c7aba79 100644
--- a/services/audioflinger/SpdifStreamOut.cpp
+++ b/services/audioflinger/SpdifStreamOut.cpp
@@ -59,6 +59,7 @@
     // TODO Move this into the audio_utils as a static method.
     switch(config->format) {
         case AUDIO_FORMAT_E_AC3:
+        case AUDIO_FORMAT_E_AC3_JOC:
             mRateMultiplier = 4;
             break;
         case AUDIO_FORMAT_AC3: