broadcom/vc5: Move default attribute value setup to the CSO and fix them.
I was generating some stub values to bring the driver up, but fill them in properly now. We now set 1.0 or 1u as appropriate, and thanks to being in their own BO it fixes piglit failures on the 7268 (where our 4-byte alignment was insufficient). Fixes const-packHalf2x16.shader_test
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