powerpc: dts: add QorIQ GPIOs

Add the QorIQ GPIO device tree nodes description. The device tree
fragments are copied over with little modification from the Linux
kernel source code.

Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/powerpc/dts/qoriq-gpio-0.dtsi b/arch/powerpc/dts/qoriq-gpio-0.dtsi
new file mode 100644
index 0000000..417fd2b
--- /dev/null
+++ b/arch/powerpc/dts/qoriq-gpio-0.dtsi
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * QorIQ GPIO device tree stub [ controller @ offset 0x130000 ]
+ *
+ * Copyright 2011 Freescale Semiconductor Inc.
+ * Copyright 2020 NXP
+ *
+ */
+
+gpio0: gpio@130000 {
+	compatible = "fsl,qoriq-gpio";
+	reg = <0x130000 0x1000>;
+	interrupts = <55 2 0 0>;
+	#gpio-cells = <2>;
+	gpio-controller;
+};