bpf: Distinguish function references in policy diagnostics

add_subprogs() rejects both BPF-to-BPF calls and BPF_PSEUDO_FUNC loads for
unprivileged programs. The latter loads a subprogram address for use as a
callback, but its Policy report currently describes it as a function call and
suggests avoiding calls that the program does not contain.

Select the operation and suggestion from the instruction kind. Preserve the
existing call wording for BPF_PSEUDO_CALL, and describe BPF_PSEUDO_FUNC as a
BPF function reference.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/bpf/d02e6a6d3b2dc43a207b8ba836ce62497b250dede9252e7409c5212201c794b7@mail.kernel.org
Link: https://lore.kernel.org/bpf/20260816015746.2632990-14-memxor@gmail.com

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