intel/blorp: Add a shader type to make keys more unique

Depending on how the driver using blorp implements its shader caching,
there is a small chance of shader collisions due to identical keys between
blit and clear programs.  Adding a small shader type at the top of the key
alleviates this problem.

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>

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