drm/i915/scaler: Add scaler tracepoints

Add some tracpoints around skl+ scaler programming to help with
debugging.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241219130827.22830-9-ville.syrjala@linux.intel.com


Reviewed-by: Luca Coelho <luciano.coelho@intel.com>