v3dv/pipeline: use pipeline depth bias enabled to fill up CFG packet

v3dv/pipeline: use pipeline depth bias enabled to fill up CFG packet

Even if the VkPipelineRasterizationStateCreateInfo sets
depthBiasEnable, internally we comput if it is really makes sense, and
use that to decide for example if we emit the Depth Offset packet.

But we were not using this to enable Depth Bias through the depth
offset enable field on the CFG packet.

So in some tests we were enabling depth bias, but not emitting the
packet to configure it, that seemed somewhat inconsistent.

This didn't cause any issue so far, but let's be conservative.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22252>