litex/__init__.py: remove retro-compat > 6 months old.

litex/__init__.py

@@ -1,13 +1,5 @@
 import sys
 
-# retro-compat 2019-09-30
-from litex.soc.interconnect import packet
-sys.modules["litex.soc.interconnect.stream_packet"] = packet
-
-# retro-compat 2019-09-29
-from litex.soc.integration import export
-sys.modules["litex.soc.integration.cpu_interface"] = export
-
 from litex.tools.litex_client import RemoteClient
 
 def get_data_mod(data_type, data_name):

litex/soc/integration/soc_zynq.py

@@ -7,7 +7,7 @@ from migen import *
 
 from litex.build.generic_platform import tools
 from litex.soc.integration.soc_core import *
-from litex.soc.integration.cpu_interface import get_csr_header
+from litex.soc.integration.export import get_csr_header
 from litex.soc.interconnect import wishbone
 from litex.soc.interconnect import axi