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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