compositor-drm: log enter/leave VT
compositor-drm: log enter/leave VT

All input devices are re-added during enter VT, so these messages in the
log will clarify what happened with input.

Signed-off-by: Pekka Paalanen <6c0263d81461c956d504307112a4ce25eaacc3d1@gmail.com>

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