Add a listxattr tool for listing xattrs

Change-Id: Ib80bab2b605ce77cd8fdc717d8bcfa8085516679
diff --git a/Android.mk b/Android.mk
index 2b7c2d1..626f6ab 100644
--- a/Android.mk
+++ b/Android.mk
@@ -678,7 +678,8 @@
     $(commands_recovery_local_path)/toybox/Android.mk \
     $(commands_recovery_local_path)/simg2img/Android.mk \
     $(commands_recovery_local_path)/adbbu/Android.mk \
-    $(commands_recovery_local_path)/libpixelflinger/Android.mk
+    $(commands_recovery_local_path)/libpixelflinger/Android.mk \
+    $(commands_recovery_local_path)/attr/Android.mk
 
 ifeq ($(shell test $(PLATFORM_SDK_VERSION) -lt 24; echo $$?),0)
     include $(commands_recovery_local_path)/libmincrypt/Android.mk