Add Dolby TrueHD audio format

Also add missing formats in AudioFlinger string conversion
utility.

Bug: 30024357
Change-Id: I75bdb54daeb786543f545ec3a772121055e01cdb
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 83e8222..149b492 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -132,6 +132,9 @@
     case AUDIO_FORMAT_AC3: return "ac-3";
     case AUDIO_FORMAT_E_AC3: return "e-ac-3";
     case AUDIO_FORMAT_IEC61937: return "iec61937";
+    case AUDIO_FORMAT_DTS: return "dts";
+    case AUDIO_FORMAT_DTS_HD: return "dts-hd";
+    case AUDIO_FORMAT_DOLBY_TRUEHD: return "dolby-truehd";
     default:
         break;
     }