freedreno,tu: Limit the amount of instructions preloaded into icache
Inferring from blob's cmdstream the size of shader instruction cache for:
- a630 is 64
- a650 is 128
- a660 is 128
On a650 and a660 gpu could hang if we exceed the limit. Though it is not reproducible with computerator or a single amber test. Also while blob limits the size to 128 - Turnip still hangs with it but does not hang with the limit of 127.
On a630 there seem to be no hang when limit is exceeded.
Fixes the hang of compute shader in Alien Isolation on a650/a660.