v3dv: vertex input support

This includes:

   * Implementation for CmdBindVertexBuffers

   * Gather vertex input info during CreateGraphicsPipelines
     (pipeline_init) and SHADER_STATE_ATTRIBUTE_RECORD prepacking

   * Final emission of such packet during CmdDraw
     (cmd_buffer_emit_graphics_pipeline)

Default attributes values will be handled on a following patch.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
4 files changed