Add tracepoints which let us know when fbc activates/deactivates/nukes.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191213133453.22152-5-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>