arm: armada: dts: Use a single dtsi for cp110 die description

Use a single dtsi file for CP110 die instead of master/slave.
Moving to single file will allow miltiple DTSI inclusions with
re-defined CP index and name.
This change will also allow support for SoCs containing more than
two CP110 dies on board.
Move pin control definitions from CP110 DTS to board DTS files

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>