selftests/bpf: Relax CPU requirements for rqspinlock stress test

Only require 2 CPUs for AA, 3 for ABBA, 4 for ABBCCA, which is
calculated nicely by adding to the mode enum. Enables running single CPU
AA tests.

Signed-off-by: Kumar Kartikeya Dwivedi <[email protected]>

Author: kkdwvd

tools/testing/selftests/bpf/test_kmods/bpf_test_rqspinlock.c

@@ -182,7 +182,7 @@ static int bpf_test_rqspinlock_init(void)
 
 	pr_err("Mode = %s\n", rqsl_mode_names[test_mode]);
 
-	if (ncpus < 3)
+	if (ncpus < test_mode + 2)
 		return -ENOTSUPP;
 
 	raw_res_spin_lock_init(&lock_a);