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: Kumar Gala <galak@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 7adb61b..24ad104 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -946,7 +946,7 @@
 
 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.