Remove reference to millisoc to make more general

.gitignore

README.md

flist/expansion_subsystem.vc

flist/expansion_subsystem_cocotb.flist

flist/millisoc_expansion_cocotb.flist

flows/makefile.simulate

logical/SRAM/verilog/SRAM_wrapper.v

logical/expansion_region/verilog/expansion_region.v

...expansion_subsystem/verilog/expansion_subsystem_wrapper.v

makefile

set_exp_env.sh

socrates/BP301_SRAM/config/SRAM_ctrl.yaml

...nic400_expansion_subsystem/nic400_expansion_subsystem.xml

verif/cocotb/expansion_subsystem_tests.py

verif/cocotb/makefile

verif/testbench/logical/expansion_subsystem_tb.v