Comment 1 for bug 1852335

The following patches were NOT applied from this upstream stable update in favor of their UBUNTU SAUCE equivalents:

* drm/i915/gtt: Add read only pages to gen8_pte_encode
* drm/i915/gtt: Read-only pages for insert_entries on bdw+
* drm/i915/gtt: Disable read-only support under GVT
* drm/i915: Rename gen7 cmdparser tables
* drm/i915: Disable Secure Batches for gen6+
* drm/i915: Remove Master tables from cmdparser
* drm/i915: Add support for mandatory cmdparsing
* drm/i915: Support ro ppgtt mapped cmdparser shadow buffers
* drm/i915: Allow parsing of unsized batches
* drm/i915: Add gen9 BCS cmdparsing
* drm/i915/cmdparser: Add support for backward jumps
* drm/i915/cmdparser: Ignore Length operands during command matching
* drm/i915: Lower RM timeout to avoid DSI hard hangs
* drm/i915/gen8+: Add RC6 CTX corruption WA
* drm/i915/cmdparser: Fix jump whitelist clearing