xhci: dbgtty: Make some functions static

The sparse tool complains as follows:

drivers/usb/host/xhci-dbgtty.c:401:5: warning:
 symbol 'xhci_dbc_tty_register_device' was not declared. Should it be static?
drivers/usb/host/xhci-dbgtty.c:452:6: warning:
 symbol 'xhci_dbc_tty_unregister_device' was not declared. Should it be static?

After commit 6ae6470bfa ("xhci: dbc: Add a operations structure
to access driver functions"), those functions are not used outside
of xhci-dbgtty.c, so this commit marks them static.

Fixes: 6ae6470bfa ("xhci: dbc: Add a operations structure to access driver functions")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20200727171149.3011-1-weiyongjun1@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-dbgtty.c

@@ -398,7 +398,7 @@ xhci_dbc_tty_exit_port(struct dbc_port *port)
 	tty_port_destroy(&port->port);
 }
 
-int xhci_dbc_tty_register_device(struct xhci_dbc *dbc)
+static int xhci_dbc_tty_register_device(struct xhci_dbc *dbc)
 {
 	int			ret;
 	struct device		*tty_dev;
@@ -449,7 +449,7 @@ register_fail:
 	return ret;
 }
 
-void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
+static void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
 {
 	struct dbc_port		*port = dbc_to_port(dbc);