drm/print: Kill ___drm_dbg()

There is no point in maintaining a separate print function, while
there is __drm_dev_dbg() function that can work with a NULL device.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240516160015.2260-1-michal.wajdeczko@intel.com


Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>