drm/i915: Pull sync_scru for device reset outside of wedge_mutex

We need to flush our srcu protecting resources about to be clobbered
by the reset, inside of our timer failsafe but outside of the
error->wedge_mutex, so that the failsafe can run in case the
synchronize_srcu() takes too long (hits a shrinker deadlock?).

Fixes: 72eb16df010a ("drm/i915: Serialise resets with wedging")
References: https://bugs.freedesktop.org/show_bug.cgi?id=109605
Signed-off-by: Chris Wilson <[email protected]>
Cc: Mika Kuoppala <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Mika Kuoppala <[email protected]>

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