powernow-k8 module missing in kernel 4.9.0-8-rt-amd64

[Suso Comesaña <susocomesanha@riseup.net>]

Hello, I was trying to activate the module powernow-k8 to put the system
in "performance" and I realized that it is not there. In the kernel
4.9.0-8-amd64 if it appears and is fully functional. It has been deleted
for something special, is it a bug? Cheers