blorp: instruct fixed functions whether to provide src depth/w

Open Lionel Landwerlin requested to merge llandwerlin/mesa:review/blorp-src-depth-w into main

We appear to have a mismatch between the compiler backend that says the shader is using those values, but we're not enabling them in the 3DSTATE_PS_EXTRA instruction.

Signed-off-by: Lionel Landwerlin Cc:

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