ARM: mvebu: Clean-up the Armada XP support

This patch removes the unneeded include of the armada-370-xp.h header.

It also moves some declarations from this file into more accurate
places.

Finally, it also adds a comment explaining that we can't remove yet the
smp field in the dt machine struct due to backward compatibly of the
device tree.

In a few releases, when the old device tree will be obsolete, we will be
able to remove the smp field and then the armada-370-xp.h header.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1414669184-16785-2-git-send-email-gregory.clement@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/mach-mvebu/coherency.c

@@ -33,7 +33,6 @@
 #include <asm/smp_plat.h>
 #include <asm/cacheflush.h>
 #include <asm/mach/map.h>
-#include "armada-370-xp.h"
 #include "coherency.h"
 #include "mvebu-soc-id.h"