Instead of having multiple functions belonging to outer_cache and
filling this structure on the fly, use a outer_cache_fns field inside
l2x0_of_data and just memcopy it into outer_cache depending of the
type of the l2x0 cache. For non DT case, the former code was kept.

[rmk: fixed a style issue]
Tested-and-Reviewed-by: NYehuda Yitschak <yehuday@marvell.com>
Tested-and-Reviewed-by: NLior Amsalem <alior@marvell.com>
Signed-off-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>