Set ApkAssets path for fabricated rros

Fabricated RROs do not provide assets but are stored on disk. Ensure
that the path to the frro is returned when querying for the ApkAssets
path (which is mostly for debug purposes).

Bug: 181338216
Test: enable frro, use cmd overlay lookup to see path in resolution
Change-Id: Ibf9b1bf0a995325affbf084c71b1e87c5682e734
diff --git a/libs/androidfw/tests/AssetManager2_test.cpp b/libs/androidfw/tests/AssetManager2_test.cpp
index e1c0fab7..3c4ee4e 100644
--- a/libs/androidfw/tests/AssetManager2_test.cpp
+++ b/libs/androidfw/tests/AssetManager2_test.cpp
@@ -765,7 +765,8 @@
 
   auto result = assetmanager.GetLastResourceResolution();
   EXPECT_EQ("Resolution for 0x7f030000 com.android.basic:string/test1\n"
-            "\tFor config -de\n\tFound initial: com.android.basic (basic/basic.apk)", result);
+            "\tFor config - de\n"
+            "\tFound initial: basic/basic.apk", result);
 }
 
 TEST_F(AssetManager2Test, GetLastPathWithMultipleApkAssets) {
@@ -784,9 +785,9 @@
 
   auto result = assetmanager.GetLastResourceResolution();
   EXPECT_EQ("Resolution for 0x7f030000 com.android.basic:string/test1\n"
-            "\tFor config -de\n"
-            "\tFound initial: com.android.basic (basic/basic.apk)\n"
-            "\tFound better: com.android.basic (basic/basic_de_fr.apk) -de", result);
+            "\tFor config - de\n"
+            "\tFound initial: basic/basic.apk\n"
+            "\tFound better: basic/basic_de_fr.apk - de", result);
 }
 
 TEST_F(AssetManager2Test, GetLastPathAfterDisablingReturnsEmpty) {