usb: phy: msm: mark msm_otg_mode_fops static

that declaration is only used inside this driver,
marking it static.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/phy-msm-usb.c

@@ -1394,7 +1394,7 @@ static ssize_t msm_otg_mode_write(struct file *file, const char __user *ubuf,
 	return status;
 }
 
-const struct file_operations msm_otg_mode_fops = {
+static const struct file_operations msm_otg_mode_fops = {
 	.open = msm_otg_mode_open,
 	.read = seq_read,
 	.write = msm_otg_mode_write,