There's no sensible reason to unite speed and interface type into
one variable. So split this variable enet_interface into two
vars: enet_interface_type, which hold the interface type and speed.
Also: add the possibility for switching between 10 and 100 MBit
interfaces on the fly, when running in FAST_ETH mode.
Signed-off-by: Heiko Schocher <firstname.lastname@example.org>
Signed-off-by: Ben Warren <email@example.com>