Update toolchain for compatibility with Arduino core 2.5.0

Author: ivankravets

platform.json

@@ -41,7 +41,7 @@
   "packages": {
     "toolchain-xtensa": {
       "type": "toolchain",
-      "version": "<3"
+      "version": "~2.40802.0"
     },
     "framework-arduinoespressif8266": {
       "type": "framework",

platform.py

@@ -23,7 +23,7 @@ def configure_default_packages(self, variables, targets):
             self.packages['sdk-esp8266']['optional'] = False
         if "buildfs" in targets:
             self.packages['tool-mkspiffs']['optional'] = False
-        if not framework or framework == "simba":
+        if not framework or "simba" in framework:
             self.packages['toolchain-xtensa']['version'] = "<2"
         return PlatformBase.configure_default_packages(
             self, variables, targets)