ppc: remove ppc_ide_md

* Add special cases for pplus and prep to ide_default_{irq,io_base}()
  (+ FIXMEs about the need to use IDE platform host driver instead).

* Remove no longer needed ppc_ide_md and struct ide_machdep_calls.

* Then remove <linux/ide.h> include from:
  - arch/powerpc/kernel/setup_32.c
  - arch/ppc/kernel/ppc_ksyms.c
  - arch/ppc/kernel/setup.c
  - arch/ppc/platforms/pplus.c
  - arch/ppc/platforms/prep_setup.c

There should be no functional changes caused by this patch.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

arch/powerpc/kernel/setup_32.c

@@ -10,9 +10,6 @@
 #include <linux/reboot.h>
 #include <linux/delay.h>
 #include <linux/initrd.h>
-#if defined(CONFIG_IDE) || defined(CONFIG_IDE_MODULE)
-#include <linux/ide.h>
-#endif
 #include <linux/tty.h>
 #include <linux/bootmem.h>
 #include <linux/seq_file.h>
@@ -51,11 +48,6 @@
 
 extern void bootx_init(unsigned long r4, unsigned long phys);
 
-#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
-struct ide_machdep_calls ppc_ide_md;
-EXPORT_SYMBOL(ppc_ide_md);
-#endif
-
 int boot_cpuid;
 EXPORT_SYMBOL_GPL(boot_cpuid);
 int boot_cpuid_phys;