wl12xx: strict_stroul introduced converted to kstrtoul

One new patch applied added a couple of new strict_strtoul calls.
Converted those to kstroul().

Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/debugfs.c

@@ -321,7 +321,7 @@ static ssize_t dtim_interval_write(struct file *file,
 		return -EFAULT;
 	buf[len] = '\0';
 
-	ret = strict_strtoul(buf, 0, &value);
+	ret = kstrtoul(buf, 0, &value);
 	if (ret < 0) {
 		wl1271_warning("illegal value for dtim_interval");
 		return -EINVAL;
@@ -386,7 +386,7 @@ static ssize_t beacon_interval_write(struct file *file,
 		return -EFAULT;
 	buf[len] = '\0';
 
-	ret = strict_strtoul(buf, 0, &value);
+	ret = kstrtoul(buf, 0, &value);
 	if (ret < 0) {
 		wl1271_warning("illegal value for beacon_interval");
 		return -EINVAL;