selftests/bpf: Align kfuncs renamed in bpf tree

bpf_task_work_schedule_resume() and bpf_task_work_schedule_signal() have
been renamed in bpf tree to bpf_task_work_schedule_resume_impl() and
bpf_task_work_schedule_signal_impl() accordingly.
There are few uses of these kfuncs in selftests that are not in bpf
tree, so that when we port [1] into bpf-next, those BPF programs will
not compile.
This patch aligns those remaining callsites with the kfunc renaming.
It should go on top of [1] when applying on bpf-next.

1: https://lore.kernel.org/all/[e-mail]/

Signed-off-by: Mykyta Yatsenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/progs/file_reader.c

···
 		err = 1;
 		return 0;
 	}
-	bpf_task_work_schedule_signal(task, &work->tw, &arrmap, task_work_callback, NULL);
+	bpf_task_work_schedule_signal_impl(task, &work->tw, &arrmap, task_work_callback, NULL);
 	return 0;
 }
 

tools/testing/selftests/bpf/progs/verifier_async_cb_context.c

···
 	if (!task)
 		return 0;
 
-	bpf_task_work_schedule_resume(task, &val->tw, &task_work_map, task_work_cb, NULL);
+	bpf_task_work_schedule_resume_impl(task, &val->tw, &task_work_map, task_work_cb, NULL);
 	return 0;
 }
 
···
 	if (!task)
 		return 0;
 
-	bpf_task_work_schedule_resume(task, &val->tw, &task_work_map, task_work_cb, NULL);
+	bpf_task_work_schedule_resume_impl(task, &val->tw, &task_work_map, task_work_cb, NULL);
 	return 0;
 }