Fill license_text field in Android.bp am: 381b809c33

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libaom/+/15055769

Change-Id: Ib81f01e3b57cafe5e025ce2ffe4b649e6c6009ef
diff --git a/Android.bp b/Android.bp
index c31105f..519a631 100644
--- a/Android.bp
+++ b/Android.bp
@@ -29,7 +29,10 @@
         "legacy_reciprocal",
         "legacy_unencumbered",
     ],
-    // large-scale-change unable to identify any license_text files
+    license_text: [
+        "libaom/LICENSE",
+        "libaom/PATENTS",
+    ],
 }
 
 aom_av1_common_intrin_avx2 = [