selftests/bpf: verifier/ringbuf.c converted to inline assembly

Test verifier/ringbuf.c automatically converted to use inline assembly.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20230325025524.144043-34-eddyz87@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>