feat(fwu): add FWU driver

Implemented FWU metadata load and verification APIs.
Also, exported below APIs to the platform:
1. fwu_init - Load FWU metadata in a structure. Also, set the
	      addresses of updated components in I/O policy
2. fwu_is_trial_run_state - To detect trial run or regular run
			    state

Change-Id: I67eeabb52d9275ac83be635306997b7c353727cd
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/include/drivers/fwu/fwu.h b/include/drivers/fwu/fwu.h
new file mode 100644
index 0000000..ae06da9
--- /dev/null
+++ b/include/drivers/fwu/fwu.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef FWU_H
+#define FWU_H
+
+#include <stdbool.h>
+
+void fwu_init(void);
+bool fwu_is_trial_run_state(void);
+
+#endif /* FWU_H */
diff --git a/include/export/common/tbbr/tbbr_img_def_exp.h b/include/export/common/tbbr/tbbr_img_def_exp.h
index 18f0125..2623c75 100644
--- a/include/export/common/tbbr/tbbr_img_def_exp.h
+++ b/include/export/common/tbbr/tbbr_img_def_exp.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -91,7 +91,17 @@
 /* FW_CONFIG */
 #define FW_CONFIG_ID			U(31)
 
+/*
+ * Primary FWU metadata image ID
+ */
+#define FWU_METADATA_IMAGE_ID		U(32)
+
+/*
+ * Backup FWU metadata image ID
+ */
+#define BKUP_FWU_METADATA_IMAGE_ID	U(33)
+
 /* Max Images */
-#define MAX_IMAGE_IDS			U(32)
+#define MAX_IMAGE_IDS			U(34)
 
 #endif /* ARM_TRUSTED_FIRMWARE_EXPORT_COMMON_TBBR_TBBR_IMG_DEF_EXP_H */