Revert "[Sanitizers][Test] XFAIL suppressions/fread_fwrite (#154189)" (#165751)
The macOS platform where test failures occured was updated to a newer
version - these tests now pass, so undoing XFAIL
rdar://163149340
This reverts commit 4dc32df3ca0a937ffb6052a40170fcc318330fd9.
Co-authored-by: Mariusz Borsa <m_borsa@apple.com>