crypto: ccp - CCP device bindings documentation

This patch provides the documentation of the device bindings
for the AMD Cryptographic Coprocessor driver.
Signed-off-by: NTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/crypto/amd-ccp.txt

+* AMD Cryptographic Coprocessor driver (ccp)
+
+Required properties:
+- compatible: Should be "amd,ccp-seattle-v1a"
+- reg: Address and length of the register set for the device
+- interrupt-parent: Should be the phandle for the interrupt controller
+  that services interrupts for this device
+- interrupts: Should contain the CCP interrupt
+
+Example:
+	ccp@e0100000 {
+		compatible = "amd,ccp-seattle-v1a";
+		reg = <0 0xe0100000 0 0x10000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 3 4>;
+	};