etnaviv: Merge blend_color and blend state
Emit the blend colors always together with the blend state.
Fixes (on GC2000, tested: X11, Weston): dEQP-GLES2.functional.fragment_ops.blend.equation_src_func_dst_func.constant
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Emit the blend colors always together with the blend state.
Fixes (on GC2000, tested: X11, Weston): dEQP-GLES2.functional.fragment_ops.blend.equation_src_func_dst_func.constant