[ARM] Kirkwood: update MPP definition.

Add MPP definitions for Marvell Kirkwood 88F6282 revision.
Update some defines to reflect datasheet's MPP names.

Signed-off-by: Benjamin Zores <benjamin.zores@alcatel-lucent.com>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
5 files changed