selftests/bpf: Enable kprobe_multi tests for ARM64

The kprobe_multi feature was disabled on ARM64 due to the lack of fprobe
support.

The fprobe rewrite on function_graph has been recently merged and thus
brought support for fprobes on arm64.  This then enables kprobe_multi
support on arm64, and so the corresponding tests can now be run on this
architecture.

Remove the tests depending on kprobe_multi from DENYLIST.aarch64 to
allow those to run in CI. CONFIG_FPROBE is already correctly set in
tools/testing/selftests/bpf/config

Signed-off-by: Alexis Lothoré (eBPF Foundation) <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Tropicao

tools/testing/selftests/bpf/DENYLIST.aarch64

@@ -1,12 +1,3 @@
-bpf_cookie/multi_kprobe_attach_api               # kprobe_multi_link_api_subtest:FAIL:fentry_raw_skel_load unexpected error: -3
-bpf_cookie/multi_kprobe_link_api                 # kprobe_multi_link_api_subtest:FAIL:fentry_raw_skel_load unexpected error: -3
-kprobe_multi_bench_attach                        # needs CONFIG_FPROBE
-kprobe_multi_test                                # needs CONFIG_FPROBE
-module_attach                                    # prog 'kprobe_multi': failed to auto-attach: -95
 fentry_test/fentry_many_args                     # fentry_many_args:FAIL:fentry_many_args_attach unexpected error: -524
 fexit_test/fexit_many_args                       # fexit_many_args:FAIL:fexit_many_args_attach unexpected error: -524
 tracing_struct/struct_many_args                  # struct_many_args:FAIL:tracing_struct_many_args__attach unexpected error: -524
-fill_link_info/kprobe_multi_link_info            # bpf_program__attach_kprobe_multi_opts unexpected error: -95
-fill_link_info/kretprobe_multi_link_info         # bpf_program__attach_kprobe_multi_opts unexpected error: -95
-fill_link_info/kprobe_multi_invalid_ubuff        # bpf_program__attach_kprobe_multi_opts unexpected error: -95
-missed/kprobe_recursion                          # missed_kprobe_recursion__attach unexpected error: -95 (errno 95)