Changing package for audio_policy_configuration_V7_0

- Changed package to use android. prefix
- Added nullability flag to xsd_config

Bug: 171572311
Test: built and atest VtsHalAudioEffectV7_0TargetTest
VtsHalAudioEffectV7_0TargetTest VtsHalAudioEffectV4_0TargetTest
VtsAidlHalAudioControlTest

Change-Id: I9ac83a98256404313b5efef17c0a164d2ee72136
Merged-In: I9ac83a98256404313b5efef17c0a164d2ee72136
diff --git a/audio/7.0/config/Android.bp b/audio/7.0/config/Android.bp
index 015c424..f67cc7c 100644
--- a/audio/7.0/config/Android.bp
+++ b/audio/7.0/config/Android.bp
@@ -1,5 +1,6 @@
 xsd_config {
     name: "audio_policy_configuration_V7_0",
     srcs: ["audio_policy_configuration.xsd"],
-    package_name: "audio.policy.configuration.V7_0",
+    package_name: "android.audio.policy.configuration.V7_0",
+    nullability: true,
 }