bpf: Add arch_bpf_trampoline_size()

This helper will be used to calculate the size of the trampoline before
allocating the memory.

arch_prepare_bpf_trampoline() for arm64 and riscv64 can use
arch_bpf_trampoline_size() to check the trampoline fits in the image.

OTOH, arch_prepare_bpf_trampoline() for s390 has to call the JIT process
twice, so it cannot use arch_bpf_trampoline_size().

Signed-off-by: Song Liu <[email protected]>
Acked-by: Ilya Leoshkevich <[email protected]>
Tested-by: Ilya Leoshkevich <[email protected]>  # on s390x
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Tested-by: Björn Töpel <[email protected]> # on riscv
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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