DragonKeyboard: Remove all_modules.

The all_modules target is being removed

Change-Id: I7bc22fea3aa7f5ad2f1dbbe5be0bad90f86ad3d7
diff --git a/DragonKeyboard/Android.mk b/DragonKeyboard/Android.mk
index 661e69a..fe48304 100644
--- a/DragonKeyboard/Android.mk
+++ b/DragonKeyboard/Android.mk
@@ -42,7 +42,7 @@
 	$(hide) mkdir -p $(dir $@) && touch $@
 
 # Run validatekeymaps unconditionally for platform build.
-droidcore all_modules : $(LOCAL_BUILT_MODULE)
+droidcore : $(LOCAL_BUILT_MODULE)
 
 # Reset temp vars.
 validatekeymaps :=