MAINTAINERS: Add maintainers for Keem Bay OCS HCU driver

Add maintainers for the Intel Keem Bay Offload Crypto Subsystem (OCS)
Hash Control Unit (HCU) crypto driver.

Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Acked-by: Declan Murphy <declan.murphy@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>