i2c: Move i2c-isa-only exported symbol declarations

Move the declaration of i2c-isa-only exported symbols to i2c-isa
itself, that's the best way to ensure nobody will attempt to use them.
Hopefully we'll get rid of the exports themselves soon anyway.

Signed-off-by: Jean Delvare <[e-mail]>

drivers/i2c/busses/i2c-isa.c

···
 #include <linux/platform_device.h>
 #include <linux/completion.h>
 
+/* Exported by i2c-core for i2c-isa only */
+extern void i2c_adapter_dev_release(struct device *dev);
+extern struct class i2c_adapter_class;
+
 static u32 isa_func(struct i2c_adapter *adapter);
 
 /* This is the actual algorithm we define */

include/linux/i2c.h

···
 #include <linux/sched.h>	/* for completion */
 #include <linux/mutex.h>
 
-/* --- For i2c-isa ---------------------------------------------------- */
-
-extern void i2c_adapter_dev_release(struct device *dev);
-extern struct class i2c_adapter_class;
 extern struct bus_type i2c_bus_type;
 
 /* --- General options ------------------------------------------------	*/