vexpress: include-if-exists tablet-dalvik-heap.mk

Change-Id: Ic26b46195820f7d1bc078fa68f5b426b31d4acb2
Signed-off-by: Vishal Bhoj <vishal.bhoj@linaro.org>
diff --git a/device.mk b/device.mk
index dbd2191..6e3afad 100644
--- a/device.mk
+++ b/device.mk
@@ -52,4 +52,4 @@
 $(call inherit-product-if-exists, external/linaro-android-kernel-test/product.mk)
 
 
-$(call inherit-product, frameworks/native/build/tablet-dalvik-heap.mk)
+$(call inherit-product-if-exists, frameworks/native/build/tablet-dalvik-heap.mk)