valgrind doesn't seem to support x32 at this time, even in current upstream.
(From OE-Core rev: 0203ae47dacc1a4b37007062f962fa8d4bd602e2)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>