powerpc: convert CONFIG_PPC_MERGE to CONFIG_PPC for legacy io checks

Now that arch/ppc is dead CONFIG_PPC_MERGE is always defined for all
powerpc platforms and we want to get rid of CONFIG_PPC_MERGE use
CONFIG_PPC instead.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
index 101a835..46455fba 100644
--- a/drivers/pnp/isapnp/core.c
+++ b/drivers/pnp/isapnp/core.c
@@ -1012,7 +1012,7 @@
 		printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
 		return 0;
 	}
-#ifdef CONFIG_PPC_MERGE
+#ifdef CONFIG_PPC
 	if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
 		return -EINVAL;
 #endif