zorro: Move zorro_bus_type to bus-private header file

zorro_bus_type was never used outside the Zorro bus code. Hence move it
from the public to the bus-private header file.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/zorro/zorro.h

···
 /* SPDX-License-Identifier: GPL-2.0 */
 
+    /*
+     *  Zorro bus
+     */
+
+extern struct bus_type zorro_bus_type;
+
+
 #ifdef CONFIG_ZORRO_NAMES
 extern void zorro_name_device(struct zorro_dev *z);
 #else

include/linux/zorro.h

···
 
 
     /*
-     *  Zorro bus
-     */
-
-extern struct bus_type zorro_bus_type;
-
-
-    /*
      *  Zorro device drivers
      */