[ARM] 5103/2: CM-X270: update core platform support

Convert CM-X270 pin configuration to use MFP tables.
Make device initialization dependent on respective driver CONFIG_ value (like
in zylonite).
Cleanup includes

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>