Set path property for filegroup modules

The path property specifies the base directory for Java files. This can
be used by the build system to filter (or filter-out) Java files by
their package names.

Bug: 135922046
Test: m
Change-Id: I19acee7aabaeb24c8e345d7d4294135482254249
diff --git a/Android.bp b/Android.bp
index d1a8937..8cf8d0d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -18,6 +18,7 @@
     srcs: [
         "src/java/android/telephony/**/*.java",
     ],
+    path: "src/java",
 }
 
 filegroup {
@@ -32,6 +33,7 @@
     srcs: [
         "src/java/**/*.java",
     ],
+    path: "src/java",
 }
 
 java_library {