UPSTREAM: kcm: use BPF_PROG_RUN

Instead of invoking struct bpf_prog::bpf_func directly, use the
BPF_PROG_RUN macro.

Bug: 140377409
Change-Id: I26abeccc8d25af0f412935ed97aebb5c64f52a2a
(cherry picked from commit a2c11b034142 ("kcm: use BPF_PROG_RUN"))
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
(cherry picked from commit 59c019fd)