Use the checkpolicy built from source.

Change-Id: I22f49db3d59b50ed8975d8c1146bb9c322adbf7e
diff --git a/Android.mk b/Android.mk
index 2b021ea..64197f1 100644
--- a/Android.mk
+++ b/Android.mk
@@ -31,7 +31,7 @@
 
 $(LOCAL_BUILT_MODULE) : $(sepolicy_policy.conf) $(HOST_OUT_EXECUTABLES)/checkpolicy
 	@mkdir -p $(dir $@)
-	$(hide) checkpolicy -M -c $(POLICYVERS) -o $@ $<
+	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@ $<
 
 sepolicy_policy.conf :=
 ##################################