[P3] Deprecate ConstQueue but leverage RegisterCluster for const values

[tancheng]

Deprecate ConstQueue (https://github.com/tancheng/VectorCGRA/tree/master/mem/const) but leverage RegisterCluster (https://github.com/tancheng/VectorCGRA/tree/master/mem/register_cluster) for const values.

Specifically,

• We need to feed the preloading const data towards RegisterCluster rather than ConstQueue here:
  

  VectorCGRA/tile/TileRTL.py

  Lines 230 to 234 in 826ccd5

  	elif s.recv_from_controller_pkt.val & (s.recv_from_controller_pkt.msg.payload.cmd == CMD_CONST):
  	s.const_mem.recv_const.val @= 1
  	s.const_mem.recv_const.msg @= s.recv_from_controller_pkt.msg.payload.data
  	# s.const_mem.recv_const.msg.predicate @= 1
  	s.recv_from_controller_pkt.rdy @= s.const_mem.recv_const.rdy

• And update the ctrl signals in all the tests accordingly
• And remove all the const related stuff across FUs like this:

  VectorCGRA/fu/single/AdderRTL.py

  Line 89 in 826ccd5

  s.recv_const.rdy @= s.send_out[0].rdy

• However, after above modifications, we are not able to iterate a set of const any more, which requires a special FU for incremental loading
  • Or we can keep above const related stuff but additionally include the RegisterCluster related preloading/config

[tancheng]

However, after above modifications, we are not able to iterate a set of const any more, which requires a special FU for incremental loading

I think this functionality is necessary, so lower priority of this issue.