Tegra: enable EHF for watchdog timer interrupts

This patch enables the Exception Handling Framework to service the WDT
interrupts on all Tegra platforms.

Verified that the watchdog timer interrupt fires after migrating to
the EHF.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I6b2e33da7841aa064e3a8f825c26fadf168cd0d5
diff --git a/plat/nvidia/tegra/include/platform_def.h b/plat/nvidia/tegra/include/platform_def.h
index 91a24ca..6bfad23 100644
--- a/plat/nvidia/tegra/include/platform_def.h
+++ b/plat/nvidia/tegra/include/platform_def.h
@@ -86,5 +86,10 @@
 #define MAX_IO_DEVICES			U(0)
 #define MAX_IO_HANDLES			U(0)
 
+/*******************************************************************************
+ * Platform macros to support exception handling framework
+ ******************************************************************************/
+#define PLAT_PRI_BITS			U(3)
+#define PLAT_TEGRA_WDT_PRIO		U(0x40)
 
 #endif /* PLATFORM_DEF_H */