unit-test: Disable valgrind testing for ppc64

There is an issue caused by inlining of a strcmp function in optimized
code that valgrind picks up as use of uninitialized memory in jmp / mov.
Just ignore running valgrind tests on powerpc for now.
https://github.com/openbmc/openbmc/issues/3315

Change-Id: I1252efdcea3acb05f1fb8043ac995645d6631805
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed