compositor: a couple debug logs
compositor: a couple debug logs

Well, they were useful to me in debugging, so probably sooner or later
useful to someone else.

Signed-off-by: Rob Clark <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@ti.com>

mchalupa/weston,giucam/weston,krezovic/weston,mchalupa/weston,Fantu/compositor-spice,Gnurou/weston,Fantu/compositor-spice,Tarnyko/weston-xdg_surface_present,Fantu/compositor-spice,krezovic/weston,udoprog/weston,jonnylamb/weston,kwm81/weston,kwm81/weston,Tarnyko/weston-xdg_surface_present,xorgy/weston,eyolfson/weston,udoprog/weston,sir-murray/weston,xorgy/weston,sir-murray/weston,eyolfson/weston,jonnylamb/weston,giucam/weston,Gnurou/weston