selftests/bpf: Enable __arena argument tests on arm64

The arena kfunc and struct_ops argument tests were restricted to x86-64
because it was the only JIT that implemented the conversions. arm64 does
now, so let them run there too: tag every program in arena_kfunc.c with
__arch_arm64 in addition to __arch_x86_64, and widen the __x86_64__
guards in the struct_ops arena test.

Without this the tests report SKIP on arm64 rather than exercising the
newly added JIT support.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Link: https://lore.kernel.org/bpf/20260813190356.335181-7-puranjay@kernel.org
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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