I've created an RPM and SRPM of the mpss 3.8.4 mpss-modules file to allow you to use your KNC Xeon Phi's on CentOS 7.6. The resulting files can be found here:
or simply install the RPM using
This works fine on my CentOS 7.6 box, but of course, use at your own risk and rattle your local Intel rep for an official update.
share and enjoy,