It's not my area, but I have a hard time believing that any competitive, modern IVI would be missing GPU integration. Just looking briefly, both Qualcomm [1] and NVIDIA [2] automotive systems have on-board GPUs.
And the price difference between a device that didn't have gpu compared to those that don't will just shrink over time so any margin you might get yesterday will not be what you can get in the future.
https://cache.freescale.com/files/32bit/doc/fact_sheet/IMX6S...
https://www.renesas.com/en-us/solutions/automotive/products/...