Turris SFP support for kernel 5.15
This PR
- drops the iflink property patch for multi-CPU DSA. It is invalid for 5.15, multi-CPU DSA will be backported from upstream differently
- backports several patches from 5.16, 5.17, 5.18 and 5.19, these are dependencies for Turris SFP patches
- adds patches for supporting Turris SFP on kernel 5.15
Fixes: #362 (closed)
Edited by Josef Schlehofer