compositor-drm: Log atomic commits and flips

Add a couple log points for tracking atomic commits and flip processing.

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
1 job for log_atomic_flips in 3 minutes and 56 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #39558
build-native

00:03:56