[ARM] 5125/1: magician: move gpio pin configuration into __initdata section

The pin configuration array is only used during board init.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>