Add a missing include for asserts.

The missing include would cause image builders fail on
-arcnext builds.

BUG=chromium:764871
TEST=emerge arc-cros-gralloc and minigbm on -arcnext.

Change-Id: Ifde30bcde72a1fae4d13c95b17273880512cafe2
Reviewed-on: https://chromium-review.googlesource.com/776640
Commit-Ready: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
diff --git a/cros_gralloc/gralloc0/gralloc0.cc b/cros_gralloc/gralloc0/gralloc0.cc
index b055f65..50cd1af 100644
--- a/cros_gralloc/gralloc0/gralloc0.cc
+++ b/cros_gralloc/gralloc0/gralloc0.cc
@@ -6,6 +6,7 @@
 
 #include "../cros_gralloc_driver.h"
 
+#include <cassert>
 #include <hardware/gralloc.h>
 #include <memory.h>