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

Moved the tsunami devices into the dev/alpha directory. Other devices "generic" devices are dependent on some of those files. That will either need to change, or most likely those devices will have to be considered architecture dependent.