intel: Set shader_spilling_rate=11 in intel_clc
A while back @mattst88 enabled shader_spilling_rate by default for anv. But intel_clc doesn't use the driconf mechanism that we use there.
The GRL shaders spill a lot, and with us now compiling additional generations of the shaders, Mesa build time is getting prohibitively expensive. By setting this, we drop the time taken for a clean debug build by approximately 35% on my current laptop.