drm/i915: Implement GGTT update method with MI_UPDATE_GTT

Implement GGTT update method with blitter command, MI_UPDATE_GTT
and install those handlers if a platform requires that.

v2: Make sure we hold the GT wakeref and Blitter engine wakeref before
we call mutex_lock/intel_context_enter below. When GT/engine are not
awake, the intel_context_enter calls into some runtime pm function which
can end up with kmalloc/fs_reclaim. But trigger fs_reclaim holding a
mutex lock is not allowed because shrinker can also try to hold the same
mutex lock. It is a circular lock. So hold the GT/blitter engine wakeref
before calling mutex_lock, to fix the circular lock.

Signed-off-by: Nirmoy Das <[email protected]>
Signed-off-by: Oak Zeng <[email protected]>
Acked-by: Oak Zeng <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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