Revert "drm/i915: Avoid waking the engines just to check if they are idle"

Revert "drm/i915: Avoid waking the engines just to check if they are idle"

This reverts commit 7da8aeec5e687e2fa3148e3d89a7cb9ddca2a1b0.

CI reports that this is not as reliable as it first appears, with
failures starting to sporadically occur in selftests.

Fixes: 7da8aeec5e68 ("drm/i915: Avoid waking the engines just to check if they are idle")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190227204654.14907-1-chris@chris-wilson.co.uk