selftests/bpf: enable many-args tests for arm64

Now that support for up to 12 args is enabled for tracing programs on
ARM64, enable the existing tests for this feature on this architecture.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Link: https://lore.kernel.org/r/20250527-many_args_arm64-v3-2-3faf7bb8e4a2@bootlin.com


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