Remove duplicated "sdk-esp8266" implementation, please use framework-esp8266-nonos-sdk

Author: ivankravets

builder/frameworks/_bare.py

@@ -254,9 +254,6 @@ def _update_max_upload_size(env):
         )
     )
 
-if not env.get("PIOFRAMEWORK"):
-    env.SConscript("frameworks/_bare.py", exports="env")
-
 #
 # Target: Build executable and linkable firmware or SPIFFS image
 #