power: bump default example implementation to version 2

Bug: 177492680
Test: Build
Signed-off-by: Wei Wang <wvw@google.com>
Change-Id: If423a7d0fb800a9528336245c7dbf42689080f0b
diff --git a/power/aidl/default/power-default.xml b/power/aidl/default/power-default.xml
index caf6ea2..9f56deb 100644
--- a/power/aidl/default/power-default.xml
+++ b/power/aidl/default/power-default.xml
@@ -1,6 +1,7 @@
 <manifest version="1.0" type="device">
     <hal format="aidl">
         <name>android.hardware.power</name>
+        <version>2</version>
         <fqname>IPower/default</fqname>
     </hal>
 </manifest>