fix: revert cpu_runqlat_tracing to use task->state CO-RE check

task_struct___7_0 with preserve_access_index causes CO-RE relocation
failure on older kernels (ubuntu20.04/kernel 5.15). The original
bpf_core_field_exists(task->state) approach with task_struct___5_14
fallback works correctly on all kernel versions (4.18+).

Fixes: bad CO-RE relocation: invalid func unknown#195896080

Signed-off-by: zhangyi <zy84338719@gmail.com>

Author: zy84338719

bpf/cpu_runqlat_tracing.c

@@ -5,7 +5,6 @@
 #include <bpf/bpf_tracing.h>
 
 #include "bpf_common.h"
-#include "bpf_compat_7_0.h"
 
 // defaultly, we use task_group address as key to operate map.
 #define TG_ADDR_KEY
@@ -124,14 +123,11 @@ long get_task_state(struct task_struct *task)
 	if (task == NULL)
 		return -1;
 
-	{
-		struct task_struct___7_0 *task7 = (struct task_struct___7_0 *)task;
-		if (bpf_core_field_exists(task7->__state)) {
-			state = BPF_CORE_READ(task7, __state);
-		} else {
-			struct task_struct___5_14 *task_new = (struct task_struct___5_14 *)task;
-			state = (long)BPF_CORE_READ(task_new, __state);
-		}
+	if (bpf_core_field_exists(task->state))
+		state = BPF_CORE_READ(task, state);
+	else {
+		struct task_struct___5_14 *task_new = (struct task_struct___5_14 *)task;
+		state = (long)BPF_CORE_READ(task_new, __state);
 	}
 
 	return state;