compat: define more ETH_P_ constants

Otherwise for 3.0, we see:
net/ether.c:23: error: 'ETH_P_TDLS' undeclared here (not in a function)
net/ether.c:24: error: 'ETH_P_AF_IUCV' undeclared here (not in a function)

Signed-off-by: Jiri Slaby <jslaby@suse.cz>