nvidia/tegra210: lp0_resume: clear the MC_INTSTATUS if MC_INTMASK was 0

The MC/SMMU should be resumed by the kernel. And the unexpected value
in the MC_INTSTATUS should be cleared before that. Or it will cause
some noisy MC interrupt once we enable the IRQ in the kernel.

BUG=chrome-os-partner:46796
BRANCH=none
TEST=LP0 suspend/resume test and the EMEM decode/arbitration errors
     should not be observed on resume.

Change-Id: I5b32fa58ebcb8e7db6ffc88e13cca050753f621a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 07cb719caf40b59c5519fcf212c2fb50f006812e
Original-Change-Id: I4d34905c04effd54d0d0edf8809e192283db2ca3
Original-Signed-off-by: Joseph Lo <josephl@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/309248
Original-Reviewed-by: Tom Warren <twarren@nvidia.com>
Original-Reviewed-by: Andrew Bresticker <abrestic@chromium.org>
Original-Commit-Queue: Joseph Lo <yushun.lo@gmail.com>
Original-Tested-by: Joseph Lo <yushun.lo@gmail.com>
Original-(cherry picked from commit 13cbcaf441bd762af9cf00eff24eb7709db38d95)
Original-Signed-off-by: Joseph Lo <josephl@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/309497
Original-Commit-Ready: Andrew Bresticker <abrestic@chromium.org>
Reviewed-on: http://review.coreboot.org/12321
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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