Documentation/bindings: crypto: inside-secure: eip197d support

This patch documents the new compatible used for the eip197d engine, as
this new engine is now supported by the Inside Secure SafeXcel
cryptographic driver.
Signed-off-by: NAntoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

Documentation/devicetree/bindings/crypto/inside-secure-safexcel.txt

 Inside Secure SafeXcel cryptographic engine
 
 Required properties:
-- compatible: Should be "inside-secure,safexcel-eip197b" or
+- compatible: Should be "inside-secure,safexcel-eip197b",
+	      "inside-secure,safexcel-eip197d" or
               "inside-secure,safexcel-eip97ies".
 - reg: Base physical address of the engine and length of memory mapped region.
 - interrupts: Interrupt numbers for the rings and engine.