ARM: dts: keystone-k2hk: Move keystone_dsp_gpio to under device-state-control

The keystone_irq node describes a device that is a member of the device
state control module address space. As such, it should not be a member
of soc0 bus but instead a sub-node of device-state-control.

This move also fixes warnings about not having a reg property. Now
that this is a sub-node of device-state-control, a syscon type node,
we add this reg property but relative to the syscon base, this way
when the dt-binding/driver are updated we can drop the non-standard
gpio,syscon-dev property completely and simply use get_resource() in
the driver.

Signed-off-by: Andrew F. Davis <[e-mail]>
Acked-by: Nishanth Menon <[e-mail]>
Signed-off-by: Santosh Shilimkar <[e-mail]>

arch/arm/boot/dts/keystone-k2hk.dtsi

···
 			};
 		};
 
-		dspgpio0: keystone_dsp_gpio@2620240 {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x240>;
-		};
+		devctrl: device-state-control@2620000 {
+			dspgpio0: keystone_dsp_gpio@240 {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x240 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x240>;
+			};
 
-		dspgpio1: keystone_dsp_gpio@2620244 {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x244>;
-		};
+			dspgpio1: keystone_dsp_gpio@244 {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x244 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x244>;
+			};
 
-		dspgpio2: keystone_dsp_gpio@2620248 {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x248>;
-		};
+			dspgpio2: keystone_dsp_gpio@248 {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x248 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x248>;
+			};
 
-		dspgpio3: keystone_dsp_gpio@262024c {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x24c>;
-		};
+			dspgpio3: keystone_dsp_gpio@24c {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x24c 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x24c>;
+			};
 
-		dspgpio4: keystone_dsp_gpio@2620250 {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x250>;
-		};
+			dspgpio4: keystone_dsp_gpio@250 {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x250 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x250>;
+			};
 
-		dspgpio5: keystone_dsp_gpio@2620254 {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x254>;
-		};
+			dspgpio5: keystone_dsp_gpio@254 {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x254 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x254>;
+			};
 
-		dspgpio6: keystone_dsp_gpio@2620258 {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x258>;
-		};
+			dspgpio6: keystone_dsp_gpio@258 {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x258 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x258>;
+			};
 
-		dspgpio7: keystone_dsp_gpio@262025c {
-			compatible = "ti,keystone-dsp-gpio";
-			gpio-controller;
-			#gpio-cells = <2>;
-			gpio,syscon-dev = <&devctrl 0x25c>;
+			dspgpio7: keystone_dsp_gpio@25c {
+				compatible = "ti,keystone-dsp-gpio";
+				reg = <0x25c 0x4>;
+				gpio-controller;
+				#gpio-cells = <2>;
+				gpio,syscon-dev = <&devctrl 0x25c>;
+			};
 		};
 
 		dsp0: dsp@10800000 {