drm/i915/dsb: Nuke the DSB debug

We'll be wanting to start the DSB from the vblank evasion critical
section so printk()s are a big nono. Get rid of the debug print.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118163040.29808-8-ville.syrjala@linux.intel.com


Reviewed-by: Animesh Manna <animesh.manna@intel.com>