tools_share/uuid: Add EFI_GUID representation

The UEFI specification details the represenatation
for the EFI_GUID type. Add this representation to the
uuid_helper_t union type so that GUID definitions
can be shared verbatim between UEFI and TF-A header
files.

Change-Id: Ie44ac141f70dd0025e186581d26dce1c1c29fce6
Signed-off-by: Tomas Pilar <tomas@nuviainc.com>

include/tools_share/uuid.h

@@ -56,8 +56,16 @@ struct uuid {
 	uint8_t		node[_UUID_NODE_LEN];
 };
 
+struct efi_guid {
+	uint32_t time_low;
+	uint16_t time_mid;
+	uint16_t time_hi_and_version;
+	uint8_t clock_seq_and_node[8];
+};
+
 union uuid_helper_t {
 	struct uuid uuid_struct;
+	struct efi_guid efi_guid;
 	uint32_t word[4];
 };