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This converts the driver to use the new tasklet API introduced in
commit 12cc923f

 ("tasklet: Introduce new initialization API")

v2: Fix up selftests/execlists.
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
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/20210126150155.1617-1-kernel@esmil.dk

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>