core/Makefile: also look for device/*/build/tasks

This eases cross-repo dependencies between device/ and
vendor/.

Change-Id: I72e283d22f16e50555ec7ba7bcf9c61ea07f083c
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
diff --git a/core/Makefile b/core/Makefile
index f0b866a..3b086c7 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1488,6 +1488,7 @@
 # These are some additional build tasks that need to be run.
 include $(sort $(wildcard $(BUILD_SYSTEM)/tasks/*.mk))
 -include $(sort $(wildcard vendor/*/build/tasks/*.mk))
+-include $(sort $(wildcard device/*/build/tasks/*.mk))
 
 # -----------------------------------------------------------------
 # Create SDK repository packages. Must be done after tasks/* since