ARM: mvebu: A38x: Remove redundant pinctrl informations

The compatible set in the armada-38x DTSI is always overridden, and the reg
defined in there is duplicated in the armada-380 and armada-385 DTSIs.

Remove these useless items.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>