x11-drivers/xf86-video-chips: Update to 1.4.0

Update x11-drivers/xf86-video-chips to 1.4.0.
This has not been run time tested due to lack of hardware.

Changelog:
https://lists.x.org/archives/xorg-announce/2019-February/002943.html

PR: 235847
Submitted by: pete@nomadlogic.org