Convert CONFIG_KM_COGE5UN et al to Kconfig

This converts the following to Kconfig:
   CONFIG_KM_COGE5UN
   CONFIG_KM_KIRKWOOD_128M16
   CONFIG_KM_KIRKWOOD
   CONFIG_KM_KIRKWOOD_PCI
   CONFIG_KM_NUSA
   CONFIG_KM_SUSE2

Cc: Holger Brunck <holger.brunck@hitachienergy.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Holger Brunck <holger.brunck@hitachienergy.com>