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iommu/arm-smmu: Reduce TLB sync timeout
We're currently waiting for up to 1 second for the TLB sync command to
finish. Unfortunately, this is long enough to trigger a watchdog bark
since the time between the watchdog pet timer interrupt and the bark
interrupt is only 1 second. Fix this by reducing the timeout to 500
milliseconds, which is still more than enough time for the TLB sync
command to complete.
CRs-Fixed: 929880
Change-Id: I467cd5fd9caa24b4f120a7fe8c8f57c73687006b
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>