[media] az6007: make all functions static

There's no reason why those functions shouldn't be static.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/dvb-usb-v2/az6007.c b/drivers/media/dvb/dvb-usb-v2/az6007.c
index bb7f61d..4a0ee64 100644
--- a/drivers/media/dvb/dvb-usb-v2/az6007.c
+++ b/drivers/media/dvb/dvb-usb-v2/az6007.c
@@ -635,7 +635,7 @@
 	return 0;
 }
 
-int az6007_power_ctrl(struct dvb_usb_device *d, int onoff)
+static int az6007_power_ctrl(struct dvb_usb_device *d, int onoff)
 {
 	struct az6007_device_state *state = d_to_priv(d);
 	int ret;
@@ -784,7 +784,7 @@
 	.functionality = az6007_i2c_func,
 };
 
-int az6007_identify_state(struct dvb_usb_device *d, const char **name)
+static int az6007_identify_state(struct dvb_usb_device *d, const char **name)
 {
 	int ret;
 	u8 *mac;