Patch by Keith Owens, with slight modifications.
His description:

The problem is net/802/Makefile which includes p8022 for any of
CONFIG_LLC, CONFIG_TR, CONFIG_IPX or CONFIG_ATALK.  p8022 calls
llc_register_sap which is in ext8022.o, that file is built by
net/core/Makefile but only for CONFIG_LLC.  It worked before because of
the wrong test in net/core/Makefile which always built ext8022.o.