Remove duplicate test expectation entries on gcstress

This CL removes some of the duplicated test expectations entries as all
they are already present in libcore_failures.txt.

Bug: 208639267
Test: vogar --mode=device \
      --expectations art/tools/libcore_failures.txt \
      --expectations art/tools/libcore_gcstress_failures.txt \
      jsr166
Change-Id: I0111fe91f7b60a3e1e6312a788c1d8178f5eb646
1 file changed