ARM: mvebu: remove unnecessary ifdef around l2x0_of_init

l2x0_of_init function is always defined
arch/arm/include/asm/hardware/cache-l2x0.h: in case of
CONFIG_CACHE_L2X0 is not selected then a placeholder is defined.
Then there is no need to have ifdef around  l2x0_of_init.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397925170-8202-2-git-send-email-gregory.clement@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>