selftests/bpf: Skip stream_deadlock test if unsupported

Test stream_deadlock currently fails on 32-bit armhf:

  run_subtest:PASS:obj_open_mem 0 nsec
  run_subtest:PASS:unexpected_load_failure 0 nsec
  do_prog_test_run:PASS:bpf_prog_test_run 0 nsec
  get_stream:FAIL:stream read unexpected stream read: actual 0 <= expected 0
  run_subtest:FAIL:1201 Unexpected retval from get_stream(): 0, errno = 95
  torvalds#399/3   stream_success/stream_deadlock:FAIL

This fails because the test depends on arch_bpf_stack_walk() i.e. support
for BPF Exceptions, which is only availble on x86_64, arm64 and s390x.
Update the BPF source with tags for these 3 archs so the test is skipped
when unsupported, as with test stream_cond_break and "may_goto" support:

  root@qemu-armhf:/usr/libexec/kselftests-bpf# ./test_progs -t stream
  torvalds#398/1   stream_failure/stream_vprintk_null_arg:OK
  torvalds#398/2   stream_failure/stream_vprintk_scalar_arg:OK
  torvalds#398/3   stream_failure/stream_vprintk_string_arg:OK
  torvalds#398     stream_failure:OK
  torvalds#399/1   stream_success/stream_exhaust:OK
  torvalds#399/2   stream_success/stream_cond_break:SKIP
  torvalds#399/3   stream_success/stream_deadlock:SKIP
  torvalds#399/4   stream_success/stream_syscall:OK
  torvalds#399     stream_success:OK (SKIP: 2/4)
  torvalds#400     stream_syscall:OK
  Summary: 3/5 PASSED, 2 SKIPPED, 0 FAILED

Signed-off-by: Tony Ambardar <[email protected]>

Author: guidosarducci

tools/testing/selftests/bpf/progs/stream.c

@@ -54,6 +54,9 @@ int stream_cond_break(void *ctx)
 }
 
 SEC("syscall")
+__arch_x86_64
+__arch_arm64
+__arch_s390x
 __success __retval(0)
 __stderr("ERROR: AA or ABBA deadlock detected for bpf_res_spin_lock")
 __stderr("{{Attempted lock   = (0x[0-9a-fA-F]+)\n"