Perf: arm64: Use proper API to get task cpu

Instead of directly accessing thread_info structure to get the
task cpu use the appropriate wrapper API. This is needed for
subsequent patches refactors the location of task cpu.

Change-Id: Ib87f42481beee04ba646aee3b0b4b5a43862713e
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
diff --git a/arch/arm64/kernel/perf_trace_counters.c b/arch/arm64/kernel/perf_trace_counters.c
index 1f0b74a..d87106d 100644
--- a/arch/arm64/kernel/perf_trace_counters.c
+++ b/arch/arm64/kernel/perf_trace_counters.c
@@ -59,7 +59,7 @@
 {
 	u32 cnten_val;
 	int current_pid;
-	u32 cpu = task_thread_info(next)->cpu;
+	u32 cpu = task_cpu(next);
 
 	if (tp_pid_state != 1)
 		return;