gpu: pvr: wire in the dynamic power-down delay calculation

gpu: pvr: wire in the dynamic power-down delay calculation

Support for this was added in the previous patch.

We're considering only the TA/3D and 2D blit commands to be part of a
command burst. The rest of the commands are power management related and
we can ignore them when detecting repeated burst patterns.

Fixes: NB#195379 - SGX sleep causes performance penalty

Signed-off-by: Imre Deak <imre.deak@nokia.com>
Reviewed-by: Luc Verhaegen <Luc.Verhaegen@basyskom.de>