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: I33c684de4c0c52012b496d2f2447eceaba26c191
diff --git a/cmds/installd/Android.bp b/cmds/installd/Android.bp
index c80ae3b..654213f 100644
--- a/cmds/installd/Android.bp
+++ b/cmds/installd/Android.bp
@@ -172,6 +172,7 @@
     srcs: [
         "binder/android/os/IInstalld.aidl",
     ],
+    path: "binder",
 }
 
 //