feat(intel): support HMAC SHA-2 MAC verify request

This command sends request on checking the integrity and authenticity
of a blob by comparing the calculated MAC with tagged MAC. The
comparison result will be returned in response.

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: Ifefdf67f088d7612d2ec2459d71faf2ec8181222
diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index 4984020..a04264d 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -76,6 +76,7 @@
 #define MBOX_FCS_DECRYPT_REQ				0x7F
 #define MBOX_FCS_RANDOM_GEN				0x80
 #define MBOX_FCS_GET_DIGEST_REQ				0x82
+#define MBOX_FCS_MAC_VERIFY_REQ				0x83
 #define MBOX_FCS_OPEN_CS_SESSION			0xA0
 #define MBOX_FCS_CLOSE_CS_SESSION			0xA1
 #define MBOX_FCS_IMPORT_CS_KEY				0xA5