definitions.mk: look for definitions.mk in device/*/build also

build/core/Makefile looks for build tasks in either device/*/build/tasks
or vendor/*/build/tasks. Do the same with vendor-specific definitions.mk.

Change-Id: Ib4fd00a1d0effe8e347382a922da101ce26bf696
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
diff --git a/core/definitions.mk b/core/definitions.mk
index afd033a..9258f41 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2200,6 +2200,7 @@
 
 # Include any vendor specific definitions.mk file
 -include $(TOPDIR)vendor/*/build/core/definitions.mk
+-include $(TOPDIR)device/*/build/core/definitions.mk
 
 # broken:
 #	$(foreach file,$^,$(if $(findstring,.a,$(suffix $file)),-l$(file),$(file)))