ARM: dts: keystone: add dsp gpio controllers nodes

Add Keystone 2 DSP GPIO nodes for SoCs:
k2hk:
 DSP GPIO banks 0-7 correspond to DSP0-DSP7
k2l:
 DSP GPIO banks 0-3 correspond to DSP0-DSP3
k2e:
 DSP GPIO bank 0 corresponds to DSP0

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
diff --git a/arch/arm/boot/dts/k2e.dtsi b/arch/arm/boot/dts/k2e.dtsi
index 03d0190..13cf35a 100644
--- a/arch/arm/boot/dts/k2e.dtsi
+++ b/arch/arm/boot/dts/k2e.dtsi
@@ -76,5 +76,12 @@
 				usb-phy = <&usb1_phy>, <&usb1_phy>;
 			};
 		};
+
+		dspgpio0: keystone_dsp_gpio@02620240 {
+			compatible = "ti,keystone-dsp-gpio";
+			gpio-controller;
+			#gpio-cells = <2>;
+			gpio,syscon-dev = <&devctrl 0x240>;
+		};
 	};
 };