usb: gadget: udc: atmel: Make some symbols static

Fix the following sparse warnings:

drivers/usb/gadget/udc/atmel_usba_udc.c:188:30: warning: symbol 'queue_dbg_fops' was not declared.
drivers/usb/gadget/udc/atmel_usba_udc.c:196:30: warning: symbol 'regs_dbg_fops' was not declared.

queue_dbg_fops and regs_dbg_fops have only call within atmel_usba_udc.c
They should be static

Fixes: 914a3f3b ("USB: add atmel_usba_udc driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Samuel Zou <zou_wei@huawei.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/gadget/udc/atmel_usba_udc.c

@@ -185,7 +185,7 @@ static int regs_dbg_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-const struct file_operations queue_dbg_fops = {
+static const struct file_operations queue_dbg_fops = {
 	.owner		= THIS_MODULE,
 	.open		= queue_dbg_open,
 	.llseek		= no_llseek,
@@ -193,7 +193,7 @@ const struct file_operations queue_dbg_fops = {
 	.release	= queue_dbg_release,
 };
 
-const struct file_operations regs_dbg_fops = {
+static const struct file_operations regs_dbg_fops = {
 	.owner		= THIS_MODULE,
 	.open		= regs_dbg_open,
 	.llseek		= generic_file_llseek,