drm/sched: stop passing non struct drm_device to drm_err() and friends

The expectation is that the struct drm_device based logging helpers get
passed an actual struct drm_device pointer rather than some random
struct pointer where you can dereference the ->dev member.

Convert drm_err(sched, ...) to dev_err(sched->dev, ...) and
similar. This matches current usage, as struct drm_device is not
available, but drops "[drm]" or "[drm] *ERROR*" prefix from logging.

Unfortunately, there's no dev_WARN_ON(), so the conversion is not
exactly the same.

Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>
Acked-by: Philipp Stanner <phasta@kernel.org>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/fe441dd1469d2b03e6b2ff247078bdde2011c6e3.1737644530.git.jani.nikula@intel.com