mpc8xx: Only build mpc8xx on arch/ppc

Currently the mpc8xx ide driver will only work on arch/ppc so only
allow it to be built there.  Also, killed a minor include that isn't
actually used by the driver.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/Kconfig

@@ -946,7 +946,7 @@ config BLK_DEV_Q40IDE
 
 config BLK_DEV_MPC8xx_IDE
 	bool "MPC8xx IDE support"
-	depends on 8xx && IDE=y && BLK_DEV_IDE=y
+	depends on 8xx && IDE=y && BLK_DEV_IDE=y && !PPC_MERGE
 	select IDE_GENERIC
 	help
 	  This option provides support for IDE on Motorola MPC8xx Systems.

drivers/ide/ppc/mpc8xx.c

@@ -32,7 +32,6 @@
 #include <asm/mpc8xx.h>
 #include <asm/mmu.h>
 #include <asm/processor.h>
-#include <asm/residual.h>
 #include <asm/io.h>
 #include <asm/pgtable.h>
 #include <asm/ide.h>