arm: mvebu: move Armada 370/XP pinctrl node definition armada-370-xp.dtsi

arm: mvebu: move Armada 370/XP pinctrl node definition armada-370-xp.dtsi

What was done by Sebastian in 264a05e19bf5 ("ARM: mvebu: armada-xp:
Add node alias to pinctrl and add base address") and 01c434225ee6
("ARM: mvebu: armada-xp: Use pinctrl node alias") can also be done for
Armada 370, i.e.

 - Rename Armada 370 pinctrl node to pin-ctrl with its address encoded
 - Add a node alias to access the pinctrl node easily.
 - use the newly available alias in existing Armada 370 .dts files

We can even go a bit further by putting the pinctrl node definition in
armada-370-xp.dtsi, with only its reg property defined. This allows us
to then also use the newly defined node alias in armada-xp.dtsi,
armada-370.dtsi.

Suggested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Link: https://lkml.kernel.org/r/b54eb45e5242728aace3ce8aef2eae4251f8dea3.1416613429.git.arno@natisbad.org
Signed-off-by: Jason Cooper <jason@lakedaemon.net>