dt-bindings: crypto: caam: use generic node name

i.MX6UL example uses a specific node name for the crypto node.
Let's fix it so we avoid this propagating further.
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/crypto/fsl-sec4.txt

@@ -138,7 +138,7 @@ iMX6QDL/SX requires four clocks
 
 iMX6UL does only require three clocks
 
-	crypto: caam@2140000 {
+	crypto: crypto@2140000 {
 		compatible = "fsl,sec-v4.0";
 		#address-cells = <1>;
 		#size-cells = <1>;