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.

Author: mykyta5

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

@@ -77,7 +77,7 @@ int on_open_validate_file_read(void *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

@@ -156,7 +156,7 @@ int task_work_non_sleepable_prog(void *ctx)
 	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;
 }
 
@@ -176,6 +176,6 @@ int task_work_sleepable_prog(void *ctx)
 	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;
 }