Adjusted Makefile to the final 'atarixl' cc65 target.
Adjusted Makefile to the final 'atarixl' cc65 target.

- Assign source files to the splitted shadow RAM areas.
- Switched to dynamic Ethernet driver loading.

MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,bluerover/6lbr,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,bluerover/6lbr,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,bluerover/6lbr,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,bluerover/6lbr,bluerover/6lbr,bluerover/6lbr,bluerover/6lbr,arurke/contiki