saa7164: remove unused saa7164_call_i2c_clients declaration

saa7164_call_i2c_clients has been removed in media/video since
commit 5a6fa3fe ("[media] saa7164: Remove unused
saa7164_call_i2c_clients()").

Then media/video has beed renamed media/pci since
commit b285192a ("[media] rename most media/video pci
drivers to media/pci").

So saa7164_call_i2c_clients is a unused declaration, remove it.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/pci/saa7164/saa7164.h

@@ -493,8 +493,6 @@ int saa7164_downloadfirmware(struct saa7164_dev *dev);
 /* saa7164-i2c.c                                               */
 extern int saa7164_i2c_register(struct saa7164_i2c *bus);
 extern int saa7164_i2c_unregister(struct saa7164_i2c *bus);
-extern void saa7164_call_i2c_clients(struct saa7164_i2c *bus,
-	unsigned int cmd, void *arg);
 
 /* ----------------------------------------------------------- */
 /* saa7164-bus.c                                               */