tools/dev/valgrind: add suppression

tools/dev/valgrind/opencl.suppr

@@ -749,3 +749,12 @@
    fun:exit
    ...
 }
+
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   obj:/usr/lib/x86_64-linux-gnu/libamdocl64.so
+   ...
+}