bpf, x86: Use emit_rsb_call() to call bpf_unwind_target()

clang inlines emit_unwind_ret_addr() and emit_patch() into do_jit() and
folds 'bpf_unwind_target - X86_PATCH_SIZE' into one relocation. It points
to a nop in the padding in front of the function, and objtool complains:

  vmlinux.o: warning: objtool: do_jit+0x1330: relocation to !ENDBR: .text+0xc7fab

It's only used to compute rel32 of a direct call, so nothing is wrong at
run time.

emit_rsb_call() does call depth accounting too and hides func from
the optimizer. Use it instead of open coding.

Fixes: cff94a3d78d8 ("bpf, x86: Support unwind_goto and unwind_exit")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org> # build
Link: https://patch.msgid.link/20261021220844.239400-1-alexei.starovoitov@gmail.com
Closes: https://lore.kernel.org/bpf/20261021201456.GA3197963@ax162/

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