hwtest/ptherm: add thermal-protection clock gating tests
hwtest/ptherm: add thermal-protection clock gating tests

Most tests work up to nva0 (on which I accidentally managed to get a value in
20400 despite the card using i2c temperature management. That's next on my todo).

grate-driver/envytools,grate-driver/envytools,karolherbst/envytools,pierremoreau/envytools,hakzsam/envytools,MoochMcGee/envytools,envytools/envytools,pierremoreau/envytools,grate-driver/envytools,envytools/envytools,kfractal/envytools,hakzsam/envytools,pierremoreau/envytools,grate-driver/envytools,grate-driver/envytools,karolherbst/envytools,pierremoreau/envytools,pierremoreau/envytools,MoochMcGee/envytools,MoochMcGee/envytools,hakzsam/envytools,kfractal/envytools,karolherbst/envytools,kfractal/envytools,hakzsam/envytools,envytools/envytools,karolherbst/envytools,MoochMcGee/envytools,MoochMcGee/envytools,envytools/envytools,karolherbst/envytools,hakzsam/envytools,kfractal/envytools,kfractal/envytools,envytools/envytools