FROMLIST: iommu/arm-smmu: Update my email address in MODULE_AUTHOR()

I no longer work for Arm, so update the stale reference to my old email
address.

Signed-off-by: Will Deacon <will@kernel.org>
Bug: 140290589
Link: https://lore.kernel.org/lkml/20191121114918.2293-15-will@kernel.org/


Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I7676e5f736fcb31376444bbfee419bc49ef17287