Make mulitple consoles work and be distinguishable from each other

Make mulitple consoles work and be distinguishable from each other

src/dev/alpha/tsunamireg.h:
    get rid of things that aren't really tsunami registers
src/dev/platform.hh:
src/dev/uart.cc:
    the uart pointer isn't used anymore
src/dev/simconsole.cc:
    make the simconsole print something more useful to distinguish between various consoles in a single system
src/dev/uart8250.hh:
    put the needed uart defines in here rather than including them from tsunamireg
src/python/m5/objects/T1000.py:
    add a console to the T1000 config for the hypervisor

--HG--
extra : convert_revision : 76ca92122e611eaf76b989bc699582eef8297be8