bpf: get_call_summary() utility function

Refactor mark_fastcall_pattern_for_call() to extract a utility
function get_call_summary(). For a helper or kfunc call this function
fills the following information: {num_params, is_void, fastcall}.

This function would be used in the next patch in order to get number
of parameters of a helper or kfunc call.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250304195024.2478889-3-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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