ppc: fix #ifdef-s in mediabay driver (take 2)

* Replace incorrect CONFIG_BLK_DEV_IDE #ifdef in
  check_media_bay() by CONFIG_MAC_FLOPPY one.

* Replace incorrect CONFIG_BLK_DEV_IDE #ifdef-s by
  CONFIG_BLK_DEV_IDE_PMAC ones.

* check_media_bay() is used only by drivers/block/swim3.c
  so make this function available only if CONFIG_MAC_FLOPPY
  is defined.

* check_media_bay_by_base() and media_bay_set_ide_infos()
  are used only by drivers/ide/ppc/pmac.c so so make these
  functions available only if CONFIG_MAC_FLOPPY is defined.

v2:
* Remove ifdefs from function prototypes. (Andrew Morton)

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/include/asm-powerpc/mediabay.h b/include/asm-powerpc/mediabay.h
index 9daa325..de83fe1 100644
--- a/include/asm-powerpc/mediabay.h
+++ b/include/asm-powerpc/mediabay.h
@@ -18,14 +18,14 @@
 #define MB_NO		7	/* media bay contains nothing */
 
 int check_media_bay(struct device_node *which_bay, int what);
-int check_media_bay_by_base(unsigned long base, int what);
 
 /* Number of bays in the machine or 0 */
 extern int media_bay_count;
 
-/* called by pmac-ide.c to register IDE controller for media bay */
-extern int media_bay_set_ide_infos(struct device_node* which_bay,
-			unsigned long base, int irq, int index);
+int check_media_bay_by_base(unsigned long base, int what);
+/* called by IDE PMAC host driver to register IDE controller for media bay */
+int media_bay_set_ide_infos(struct device_node *which_bay, unsigned long base,
+			    int irq, int index);
 
 #endif /* __KERNEL__ */
 #endif /* _PPC_MEDIABAY_H */