Match src paths with aidl package name

In order for the build system to track updates to the header files
during incremental builds, always specify the src files using the same
path as the package for C++ compilations.

Bug: 112114177
Test: treehugger
Change-Id: Icb04e0cf2fbfe0ec32b3a663adbc1c1e9b913821
diff --git a/Android.bp b/Android.bp
index c81e41c..0ae5f8a 100644
--- a/Android.bp
+++ b/Android.bp
@@ -23,6 +23,7 @@
         "binder/com/google/android/startop/iorap/IIorap.aidl",
         "binder/com/google/android/startop/iorap/ITaskListener.aidl",
     ],
+    path: "binder",
 }
 
 cc_defaults {