feat(intel): support SHA-2 hash digest generation on a blob

This command is to request the SHA-2 hash digest on a blob.
If input has a key, the output shall be key-hash digest.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
Signed-off-by: Boon Khai Ng <boon.khai.ng@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
Change-Id: I08cb82d89a8e8f7bfe04f5f01e079ea49fe38cf5
diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index f969a35..4984020 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -75,6 +75,7 @@
 #define MBOX_FCS_ENCRYPT_REQ				0x7E
 #define MBOX_FCS_DECRYPT_REQ				0x7F
 #define MBOX_FCS_RANDOM_GEN				0x80
+#define MBOX_FCS_GET_DIGEST_REQ				0x82
 #define MBOX_FCS_OPEN_CS_SESSION			0xA0
 #define MBOX_FCS_CLOSE_CS_SESSION			0xA1
 #define MBOX_FCS_IMPORT_CS_KEY				0xA5