drm/i915: Move breadcrumbs irq_posted up a level to engine

In the next patch, we will use the irq_posted technique for another
engine interrupt, rather than use two members for the atomic updates, we
can use two bits of one instead. First, we need to update the
breadcrumbs to use the new common engine->irq_posted.

v2: Use set_bit() rather than __set_bit() to ensure atomicity with
respect to other bits in the mask

Signed-off-by: Chris Wilson <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Mika Kuoppala <[email protected]>

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