[new_pymtl] rm unneeded subclassing of Bits
[new_pymtl] rm unneeded subclassing of Bits

cfelton/pymtl,cornell-brg/pymtl,tj93/pymtl,12yujim/pymtl,cornell-brg/pymtl,jjffryan/pymtl,cfelton/pymtl,tj93/pymtl,cfelton/pymtl,jck/pymtl,12yujim/pymtl,12yujim/pymtl,cornell-brg/pymtl,jjffryan/pymtl,Glyfina-Fernando/pymtl,jck/pymtl,tj93/pymtl,jck/pymtl,Glyfina-Fernando/pymtl,Glyfina-Fernando/pymtl,jjffryan/pymtl