audio: Add example HAL implementation

This is partial implementation of the example V7.0 audio HAL
which passes VTS tests. Note that the 'core' part
of the HAL (IDevice/IStream) isn't implemented yet.
It passes VTS because it doesn't provide any devices
(modules) and the audio HAL isn't the 'default' instance.

Bug: 142480271
Test: atest VtsHalAudioV7_0TargetTest
      atest VtsHalAudioEffectV7_0TargetTest
Change-Id: Ie3dd62c5db1cdb5534df4dd7f326c4c8776bf3c4
diff --git a/audio/common/7.0/example/android.hardware.audio@7.0-service.example.rc b/audio/common/7.0/example/android.hardware.audio@7.0-service.example.rc
new file mode 100644
index 0000000..cf8b51f
--- /dev/null
+++ b/audio/common/7.0/example/android.hardware.audio@7.0-service.example.rc
@@ -0,0 +1,7 @@
+service vendor.audio-hal-7-0 /vendor/bin/hw/android.hardware.audio@7.0-service.example
+    class hal
+    user audioserver
+    group audio
+    capabilities BLOCK_SUSPEND
+    ioprio rt 4
+    task_profiles ProcessCapacityHigh HighPerformance