microwatt/verilator
Anton Blanchard 8acd5a5607 verilator: Specify top level module
While verilator finds the correct top level module with the current
setup, if we start adding simulation models it can get confused.

Explicitly specify the top level module.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
..
microwatt-verilator.cpp verilator: Specify top level module
uart-verilator.c