dt-bindings: crypto: Add Keem Bay OCS HCU bindings

Add device-tree bindings for the Intel Keem Bay Offload Crypto Subsystem
(OCS) Hashing Control Unit (HCU) crypto driver.

Signed-off-by: Declan Murphy <declan.murphy@intel.com>
Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Acked-by: Mark Gross <mgross@linux.intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>