drm/i915/dg2: Add preemption changes for Wa_14015141709

Starting with DG2, preemption can no longer be controlled using userspace
on a per-context basis. Instead, the hardware only allows us to enable or
disable preemption in a global, system-wide basis.  Also, we lose the
ability to specify the preemption granularity (such as batch-level vs
command-level vs object-level).

v2 (MattR):
 - Move debugfs interface to a separate patch.  (Jani)
v3 (MattR):
 - Drop the debugfs support completely for now.

Cc: Matt Roper <[email protected]>
Cc: Prathap Kumar Valsan <[email protected]>
Cc: John Harrison <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Signed-off-by: Akeem G Abodunrin <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Anusha Srivatsa <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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