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The SMMU configuration can get corrupted or updated by
external clients during boot without our knowledge.

This patch introduces a "verify" function for the SMMU
driver, to check that the boot configuration settings are
intact.  Usually, this function should be called at the
end of the boot cycle.

This function only calls panic() on silicon platforms.

Change-Id: I2ab45a7f228781e71c73ba1f4ffc49353effe146
Signed-off-by: George Bauernschmidt <georgeb@nvidia.com>