usb: chipidea: debug: fix sparse non static symbol warnings

Fixes the following sparse warnings:

drivers/usb/chipidea/debug.c:211:5: warning:
 symbol 'ci_otg_show' was not declared. Should it be static?
drivers/usb/chipidea/debug.c:334:5: warning:
 symbol 'ci_registers_show' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/chipidea/debug.c

@@ -208,7 +208,7 @@ static const struct file_operations ci_requests_fops = {
 	.release	= single_release,
 };
 
-int ci_otg_show(struct seq_file *s, void *unused)
+static int ci_otg_show(struct seq_file *s, void *unused)
 {
 	struct ci_hdrc *ci = s->private;
 	struct otg_fsm *fsm;
@@ -331,7 +331,7 @@ static const struct file_operations ci_role_fops = {
 	.release	= single_release,
 };
 
-int ci_registers_show(struct seq_file *s, void *unused)
+static int ci_registers_show(struct seq_file *s, void *unused)
 {
 	struct ci_hdrc *ci = s->private;
 	u32 tmp_reg;