drm/i915: Remove unused inline function drain_delayed_work()
It is not used since commit 058179e7 ("drm/i915/gt: Replace hangcheck by heartbeats") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20200715032104.32052-1-yuehaibing@huawei.com
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