build: Add matcha HW targets

 * Refactor opentitan SW target to build the artifacts for the verilator
   simulation
 * Add verilator to PATH
 * Add matcha HW verilator build and run targets (call
   scripts/run-chip-verilator-sim.sh)

Change-Id: Idaf10e5934668d381926faceb133ce08928d6bdd
4 files changed