IOMMU Fixes for Linux v3.14-rc3

The fixes are only for the ARM-SMMU driver. Here is the summary from
Will Deacon:

  - Andreas Herrmann took the driver for a run with a real SATA
    controller, which caused the new mutex-based locking to explode
    since we require mappings in atomic context

  - Yifan fixed an issue with the page table creation, which then caused
    breakages with the way in which we flush descriptors out to the
    table walker

  - I ran the driver on a system where the SMMU is hooked into a
    coherent interconnect for table walks, and noticed a shareability
    mismatch between the CPU and the SMMU

These issues are all fixed here and have been tested on both arm and
arm64 based systems.

Besides that I put a fix on-top to make the spinlock irq-safe, so that the
code-paths can be used in the DMA-API.
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