Commit 6638760
 ("ARM: mvebu: Enable PUP register")
correctly enables devices that are disabled after boot-up due to
some Design For Testability registers.

However, although harmless on Armada 370, call the code conditionally
on Armada XP only. While at it, move PUP register defines to SYSCTL
registers where they belong to.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>