audio: Remove dependency on libxml2 from the default implementation

The default implementation switched to use the "enums"
module generated from the audio_policy_configuration.xsd schema.

This drops the dependency on libxml2 library and reduces
PSS and private dirty memory usage.

Bug: 180413957
Test: atest VtsHalAudioV7_0TargetTest
Change-Id: If7c110cd2bd2698923957b39906a0896d18065dd
diff --git a/audio/common/7.0/Android.bp b/audio/common/7.0/Android.bp
index 1c016b4..47f031f 100644
--- a/audio/common/7.0/Android.bp
+++ b/audio/common/7.0/Android.bp
@@ -16,15 +16,14 @@
 cc_library {
     name: "android.hardware.audio.common@7.0-enums",
     vendor_available: true,
-    generated_headers: ["audio_policy_configuration_V7_0"],
-    generated_sources: ["audio_policy_configuration_V7_0"],
+    generated_headers: ["audio_policy_configuration_V7_0_enums"],
+    generated_sources: ["audio_policy_configuration_V7_0_enums"],
     header_libs: ["libxsdc-utils"],
-    export_generated_headers: ["audio_policy_configuration_V7_0"],
+    export_generated_headers: ["audio_policy_configuration_V7_0_enums"],
     export_header_lib_headers: ["libxsdc-utils"],
     export_include_dirs: ["enums/include"],
     shared_libs: [
         "libbase",
         "liblog",
-        "libxml2",
     ],
 }