v3dv: check the render area against the clip window

And flag dirty scissor state if the render area is constraining the
current clip window, so that we emit a new clip window with the next
draw call.

Also, remove the early emission of a clip window for the render area
if we didn't have any scissor state. TLB clears ignore the clip
window, so this was doing nothing for us.

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