Hello Samuel Stewart,
LS1088A is not PPFE( Programmable Packet Forwarding Engine) based platform, pfe.ko is Kernel driver module for PPFE.
If you want to use Broadcom phy on the target, please define "CONFIG_PHY_BROADCOM" and remove "#define CONFIG_PHY_VITESSE" in u-boot source code include/configs/ls1088ardb.h.
Please modify board/freescale/ls1088a/eth_ls1088ardb.c in u-boot source code according to your target board.
Thanks,
Yiping