Migrate to AAPT2

Bug: 73128633
Test: make checkbuild
Change-Id: I4b6b73299d1cae61994c34ebb77ca587c5ee64ff
diff --git a/packages/SettingsLib/Android.mk b/packages/SettingsLib/Android.mk
index 859f86fa..5a8be31 100644
--- a/packages/SettingsLib/Android.mk
+++ b/packages/SettingsLib/Android.mk
@@ -3,6 +3,8 @@
 
 LOCAL_USE_AAPT2 := true
 
+LOCAL_AAPT2_ONLY := true
+
 LOCAL_MODULE := SettingsLib
 
 LOCAL_JAVA_LIBRARIES := \