Revert "ARM: dts: armada-39x: Fix compatible string for gpios"

This reverts commit d10886a4e6f85ee18d47a1066a52168461370ded.

If compatible = "marvell,armadaxp-gpio", the reg property requires a
second (address, size) pair, which points to the per-CPU interrupt
registers <0x18800 0x30> / <0x18840 0x30>.

Furthermore:
Commit 5f79c651e81e explains very well, why the gpio-mvebu driver does not
work reliably with per-CPU interrupts.
Commit 988c8c0cd04d deprecates compatible = marvell,armadaxp-gpio for this
reason.

Signed-off-by: Klaus Kudielka <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

arch/arm/boot/dts/armada-39x.dtsi

···
 			};
 
 			gpio0: gpio@18100 {
-				compatible = "marvell,armadaxp-gpio", "marvell,orion-gpio";
+				compatible = "marvell,orion-gpio";
 				reg = <0x18100 0x40>;
 				ngpios = <32>;
 				gpio-controller;
···
 			};
 
 			gpio1: gpio@18140 {
-				compatible = "marvell,armadaxp-gpio", "marvell,orion-gpio";
+				compatible = "marvell,orion-gpio";
 				reg = <0x18140 0x40>;
 				ngpios = <28>;
 				gpio-controller;