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

crypto node should use the "crypto" generic naming,
and not a specific one.
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/crypto/fsl-imx-sahara.txt

@@ -8,7 +8,7 @@ Required properties:
 
 Example:
 
-sah@10025000 {
+sah: crypto@10025000 {
 	compatible = "fsl,imx27-sahara";
 	reg = <	0x10025000 0x800>;
 	interrupts = <75>;