SecurityPkg/Tcg2: handle PRE HASH and LOG ONLY

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2376

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Qi Zhang <qi1.zhang@intel.com>
Message-Id: <20200818062618.3698-8-qi1.zhang@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>

SecurityPkg/Include/Ppi/Tcg.h

@@ -18,6 +18,11 @@ typedef struct _EDKII_TCG_PPI EDKII_TCG_PPI;
 //
 #define EDKII_TCG_PRE_HASH  0x0000000000000001
 
+//
+// This bit is shall be set when HashData is the pre-hash digest and log only.
+//
+#define EDKII_TCG_PRE_HASH_LOG_ONLY  0x0000000000000002
+
 /**
   Tpm measure and log data, and extend the measurement result into a specific PCR.