Make cronet file_contexts as "android:path" property

It follows examples of other APEX to make file_contexts of cronet
module as "android:path" property

Bug: 146416755
Test: atest cronet_e2e_tests
Test: atest CronetApiTest
Change-Id: I0608eb4bb43cee50f49217f19fb53f297fbf5ead
Merged-In: I0608eb4bb43cee50f49217f19fb53f297fbf5ead
diff --git a/apex/Android.bp b/apex/Android.bp
index 2196529..54c3d1c 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -63,6 +63,13 @@
 }
 
 filegroup {
+  name: "com.android.cronet-file_contexts",
+  srcs: [
+    "com.android.cronet-file_contexts",
+  ],
+}
+
+filegroup {
   name: "com.android.ipsec-file_contexts",
   srcs: [
     "com.android.ipsec-file_contexts",