Tegra194: add RAS exception handling

This patch adds all Tegra194 RAS nodes definitions and support to
handle all uncorrectable RAS errors.

Change-Id: I109b5a8dbca91d92752dc282c4ca30f273c475f9
Signed-off-by: David Pu <dpu@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/include/lib/extensions/ras.h b/include/lib/extensions/ras.h
index 4fc8f04..793ab9f 100644
--- a/include/lib/extensions/ras.h
+++ b/include/lib/extensions/ras.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -192,6 +193,7 @@
 			probe_data);
 }
 
+const char *ras_serr_to_str(unsigned int serr);
 int ras_ea_handler(unsigned int ea_reason, uint64_t syndrome, void *cookie,
 		void *handle, uint64_t flags);
 void ras_init(void);