powerpc: Fix modular build of ide-pmac when mediabay is built in

Now that the powermac IDE host driver can be modular, we need to
export check_media_bay_by_base() and media_bay_set_ide_infos()
from drivers/macintosh/mediabay.c for it.

This fixes the following build error:

> CC [M]  drivers/ide/pmac.o
> drivers/ide/pmac.c: In function ‘pmac_ide_init_dev’:
> drivers/ide/pmac.c:955: error: implicit declaration of function
> ‘check_media_bay_by_base’
> drivers/ide/pmac.c: In function ‘pmac_ide_setup_device’:
> drivers/ide/pmac.c:1090: error: implicit declaration of function
> ‘media_bay_set_ide_infos’
> make[2]: *** [drivers/ide/pmac.o] Error 1
> make[1]: *** [drivers/ide] Error 2
> make: *** [drivers] Error 2

Reported-by: Subrata Modak <subrata@linux.vnet.ibm.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

drivers/macintosh/mediabay.c

@@ -447,6 +447,7 @@ int check_media_bay_by_base(unsigned long base, int what)
 
 	return -ENODEV;
 }
+EXPORT_SYMBOL_GPL(check_media_bay_by_base);
 
 int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
 			    int irq, ide_hwif_t *hwif)
@@ -486,6 +487,7 @@ int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
 
 	return -ENODEV;
 }
+EXPORT_SYMBOL_GPL(media_bay_set_ide_infos);
 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 
 static void media_bay_step(int i)