Update notes for submitted changes

* msm: kgsl: Enable protected register mode for A2XX
* msm: kgsl: Mark the IOMMU setstate memory as read only
* msm: kgsl: Protect CP_STATE_DEBUG_INDEX
* msm: kgsl: Print the register that causes a protected mode error
* msm: kgsl: Protect SMMU registers from being written by the GPU
* msm: kgsl: Enable protected register mode for A3XX
* msm: kgsl: Setup a3xx protection in its start function