arch/arm: fix regression by spinlock change

| commit c96b8cdfdd
| Author: hujun5 <hujun5@xiaomi.com>
| Date:   Mon Dec 23 16:59:20 2024 +0800
|
|     use small lock in following files:

Signed-off-by: chao an <anchao.archer@bytedance.com>

arch/arm/src/stm32l4/stm32l4_qencoder.c

@@ -1043,7 +1043,7 @@ static int stm32l4_position(struct qe_lowerhalf_s *lower,
 
   /* Loop until we are certain that no interrupt occurred between samples */
 
-  spin_lock_irqsave(&priv->lock);
+  flags = spin_lock_irqsave(&priv->lock);
   do
     {
       position = priv->position;