feat(handoff): common API for TPM event log handoff

Create a common BL2 API to add a TE for TPM event log.

Change-Id: I459e70f40069aa9ea0625977e0bad8ec316439e6
Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index 118b537..b43f131 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -299,6 +299,16 @@
 #if (MEASURED_BOOT || DICE_PROTECTION_ENVIRONMENT)
 void bl2_plat_mboot_init(void);
 void bl2_plat_mboot_finish(void);
+#if TRANSFER_LIST
+int plat_handoff_mboot(const void *data, uint32_t data_size, void *tl_base);
+#else
+static inline int
+plat_handoff_mboot(__unused const void *data, __unused uint32_t data_size,
+	      __unused void *tl_base)
+{
+	return -1;
+}
+#endif
 #else
 static inline void bl2_plat_mboot_init(void)
 {