m68knommu: add smc91x support for ColdFire NETtel boards

The ColdFire based NETtel boards use the SMC9196 ethernet devices.
Switch to using a platform setup for these parts using the smc91x driver.
The init code is taken strait out of arch/m68k/include/asm/mcfsmc.h,
just cleaned up a bit.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>