ANDROID: KVM: arm64: iommu: Fix lock in iova_to_phys

In commit 3f596ed5c5bd
("ANDROID: KVM: arm64: smmu-v3: Reduce critical section in map() and unmap()")

iommu_domains_lock was removed from map/unmap/iova_to_phys.
However, taking the lock was left there (and extra new line).

Bug: 277989609
Bug: 278749606

Change-Id: Id25a1882eed125432e144e96b9eafde7d1807879
Signed-off-by: Mostafa Saleh <smostafa@google.com>