Disable EEE on OpenWrt DSA interface

After moving my HP Color LaserJet Pro MFP M477fdw from my Huawei S6720-32C-PWH-SI to a Ubiquiti Unifi Switch Flex running OpenWrt master, I noticed the printer randomly coming out of standby. Looking at the OpenWrt log, I noticed the DSA interface connected to the printer to be flapping.