drm/i915: Actually flush interrupts on reset not just wedging

Commit 0f36a85c3bd5 ("drm/i915: Flush pending interrupt following a GPU
reset") got confused and only applied the flush to the set-wedge path
(which itself is proving troublesome), but we also need the
serialisation on the regular reset path. Oops.

Move the interrupt into reset_irq() and make it common to the reset and
final set-wedge.

v2: reset_irq() after port cancellation, as we assert that
execlists->active is sane for cancellation (and is being reset by
reset_irq).

References: 0f36a85c3bd5 ("drm/i915: Flush pending interrupt following a GPU reset")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Cc: Michel Thierry <[email protected]>
Cc: Michał Winiarski <[email protected]>
Cc: Jeff McGee <[email protected]>
Reviewed-by: Mika Kuoppala <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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