selftests/bpf: Enable timed may_goto tests for arm64

As arm64 JIT now supports timed may_goto instruction, make sure all
relevant tests run on this architecture. Some tests were enabled and
other required modifications to work properly on arm64.

 $ ./test_progs -a "stream*","*may_goto*",verifier_bpf_fastcall

 #404     stream_errors:OK
 [...]
 #406/2   stream_success/stream_cond_break:OK
 [...]
 #494/23  verifier_bpf_fastcall/may_goto_interaction_x86_64:SKIP
 #494/24  verifier_bpf_fastcall/may_goto_interaction_arm64:OK
 [...]
 #539/1   verifier_may_goto_1/may_goto 0:OK
 #539/2   verifier_may_goto_1/batch 2 of may_goto 0:OK
 #539/3   verifier_may_goto_1/may_goto batch with offsets 2/1/0:OK
 #539/4   verifier_may_goto_1/may_goto batch with offsets 2/0:OK
 #539     verifier_may_goto_1:OK
 #540/1   verifier_may_goto_2/C code with may_goto 0:OK
 #540     verifier_may_goto_2:OK
 Summary: 7/16 PASSED, 25 SKIPPED, 0 FAILED

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Link: https://lore.kernel.org/r/20250827113245.52629-3-puranjay@kernel.org


Signed-off-by: Alexei Starovoitov <ast@kernel.org>