Fix allowlist in order to mixed_build the entire prod allowlist.

Bug: 279808471
Test: m nothing --ensure-allowlist-integrity

Change-Id: Ie7c18e1457d29f300e790ea8a38fbcdc4fdcc50a
diff --git a/android/allowlists/allowlists.go b/android/allowlists/allowlists.go
index 67ca8ec..a4df34c 100644
--- a/android/allowlists/allowlists.go
+++ b/android/allowlists/allowlists.go
@@ -291,6 +291,7 @@
 		"packages/modules/Gki/libkver":                       Bp2BuildDefaultTrue,
 		"packages/modules/NetworkStack/common/captiveportal": Bp2BuildDefaultTrue,
 		"packages/modules/NeuralNetworks/apex":               Bp2BuildDefaultTrue,
+		"packages/modules/NeuralNetworks/apex/testing":       Bp2BuildDefaultTrue,
 		"packages/providers/MediaProvider/tools/dialogs":     Bp2BuildDefaultFalse, // TODO(b/242834374)
 		"packages/screensavers/Basic":                        Bp2BuildDefaultTrue,
 		"packages/services/Car/tests/SampleRearViewCamera":   Bp2BuildDefaultFalse, // TODO(b/242834321)