Changelog for iavf-4.2.7

Add PTP support by direct&indirect PHC register access
Add new virtchnl format to set default MAC
Add support for handling flexible descriptor format
Add checksum logic to support UDP error detection
Del RDMA client support
Refactor processing of VLAN V2 capability message
Fix deadlock in iavf_virtchnl_completion
Fix bonding balance modes
Fix misalignment of netdev mac address and MacVlan filters
Fix adding of tc flower filters to tc0
Fix ethtool stats request scheduling
Fix ADD_PROBES build errors
Fix several kernel-doc
Fix build failures on current upstream and OSV kernels