selftests/bpf: End the loop of parallel_test_bitmap after 50 ms

The two progs of parallel_test_bitmap change bits of the same words in a
loop of 10000000 iterations with can_loop. The loop goes on until may_goto
stops it. The functions that it calls retry a cmpxchg that fails:

  do {
          ...
          actual = cmpxchg(&bmp->bits[idx], old, new);
          if (actual == old)
                  return true;
  } while (can_loop);
  return false;

The retry is always possible only while each stack frame has a time slice
of its own. With one time slice for all may_goto of a prog, a function that
is called after the time is up makes no iteration. The bit does not change,
and the test fails with -EINVAL, in 53 of 900 runs.

Leave the loop after 50 ms.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261031215543.682284-5-alexei.starovoitov@gmail.com

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