Zero initialize audio_port_config and containing structs

Add zero initialization for struct audio_port_config and
the structures that contain it: audio_port and audio_patch.

Left intact places where the struct is overwritten completely
or memset'd right after declaration.

Test: make
Change-Id: I889e55fd7c7b8810ef840090a9f0a85d55eaedb3
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 5d67799..a35e6db 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -3185,10 +3185,10 @@
         return BAD_VALUE;
     }
 
-    struct audio_port_config backupConfig;
+    struct audio_port_config backupConfig = {};
     status_t status = audioPortConfig->applyAudioPortConfig(config, &backupConfig);
     if (status == NO_ERROR) {
-        struct audio_port_config newConfig;
+        struct audio_port_config newConfig = {};
         audioPortConfig->toAudioPortConfig(&newConfig, config);
         status = mpClientInterface->setAudioPortConfig(&newConfig, 0);
     }
@@ -3336,7 +3336,7 @@
     sp<AudioSourceDescriptor> sourceDesc =
             new AudioSourceDescriptor(srcDeviceDesc, attributes, uid);
 
-    struct audio_patch dummyPatch;
+    struct audio_patch dummyPatch = {};
     sp<AudioPatch> patchDesc = new AudioPatch(&dummyPatch, uid);
     sourceDesc->mPatchDesc = patchDesc;