feat(intel): support ECDSA Get Public Key

To support the ECDSA feature and send the command
as a request to get the public key

Signed-off-by: Boon Khai Ng <boon.khai.ng@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
Change-Id: I9d7bb5b6ab8ef7d4f3ceb21ff0068baf3175a1ac
diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index a7e2bc3..1d749a0 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -78,6 +78,7 @@
 #define MBOX_FCS_AES_CRYPT_REQ				0x81
 #define MBOX_FCS_GET_DIGEST_REQ				0x82
 #define MBOX_FCS_MAC_VERIFY_REQ				0x83
+#define MBOX_FCS_ECDSA_GET_PUBKEY			0x88
 #define MBOX_FCS_OPEN_CS_SESSION			0xA0
 #define MBOX_FCS_CLOSE_CS_SESSION			0xA1
 #define MBOX_FCS_IMPORT_CS_KEY				0xA5