Don't depend on x86 valgrind

Valgrind is not supported for x86+SSE4, so we don't build an x86
version.  Don't depend on it to avoid triggering dangling
dependency checks.

Test: lunch aosp_x86-eng && m checkbuild
Change-Id: I156bcdf92d9a70ad7e796e1d7e69f5797c9f1738
1 file changed