v3dv: add v3dv_limits file

v3dv: add v3dv_limits file

There are several definitions for hw limits on v3dv_image that we want
to share, but v3dv_private was already growing bigger and messier.

So let's move them to a specific header. Note that there is already a
broadcom/common/v3d_limits.h. We are not putting them there because
right now they are only used by the Vulkan driver, but are candidates
to be moved.

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