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Cross-subsystem Changes:

- Includes gvt-gt-next-2021-01-18 + header check fix for GVT

Driver Changes:

- Fix for #2955: Clear potentially malicious register state before
  executing clear residuals security mitigation (Chris)
- Fixes that lead to marking per-engine-reset as supported on Gen7
  (Chris)
- Remove per-client stats from debugfs/i915_gem_objects) (Tvrtko, Chris)
- Add arbitration check before semaphore wait (Chris)
- Apply interactive priority to explicit flip fences (Chris)
- Make GEM errors non-fatal by default to help capturing logs during
  development (Chris)
- Fix object page offset within a region in error capture (CQ, Matt A)
- Close race between enable_breadcrumbs and cancel_breadcrumbs (Chris)
- Almagamate clflushes on suspend/freeze to speed up S/R (Chris)
- Protect used framebuffers from casual eviction (Chris)

- Fix the sgt.pfn sanity check (Kui, Matt A)
- Reduce locking around i915_request.lock and ctx->engines_mutex (Chris)
- Simplify tracking for engine->fw_active and stats.active (Chris)
- Constrain pool objects by mapping type (Chris, Matt A)
- Use shrinkable status for unknown swizzle quirks (Chris)
- Do not suspend bonded requests if one hangs (Chris)
- Restore "Skip over completed active execlists" optimization (Chris)

- Move stolen node into GEM object union (Chris)
. Split gem_create into own file (Matt A)
- Convert object_create into object_init in LMEM region code (Matt A)
- Reduce test_and_set_bit to set_bit in i915_request_submit() (Chris)
- Mark up protected uses of 'i915_request_completed' (Chris)
- Remove extraneous inline modifiers (Chris)
- Add function to define defaults for GuC/HuC enable (John)

- Improve code locality by moving closer to single user (Matt A, Chris)
- Compiler warning fixes (Matt A, Chris)
- Selftest / CI improvements (Chris)