drm/vmwgfx: Fix handling of dumb buffers

drm/vmwgfx: Fix handling of dumb buffers

Dumb buffers can be used in kms but also through prime with gallium's
resource_from_handle. In the second case the dumb buffers can be
rendered by the GPU where with the regular DRM kms interfaces they
are mapped and written to by the CPU. Because the same buffer can
be written to by the GPU and CPU vmwgfx needs to use vmw_surface (object
which properly tracks dirty state of the guest and gpu memory)
instead of vmw_bo (which is just guest side memory).

Furthermore the dumb buffer handles are expected to be gem objects by
a lot of userspace.

Make vmwgfx accept gem handles in prime and kms but internally switch
to vmw_surface's to properly track the dirty state of the objects between
the GPU and CPU.

Fixes new kwin and kde on wayland.

Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Fixes: b32233acceff ("drm/vmwgfx: Fix prime import/export")
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.9+
Reviewed-by: Maaz Mombasawala <maaz.mombasawala@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240722184313.181318-4-zack.rusin@broadcom.com