twister: adapt platform schema

Adapt schema to use twister instead of sanitycheck.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

scripts/schemas/twister/platform-schema.yaml

@@ -6,7 +6,7 @@
 # a YAML structure validator, to validate the YAML files that describe
 # Zephyr test platforms
 #
-# The original spec comes from Zephyr's sanitycheck script
+# The original spec comes from Zephyr's twister script
 #
 
 type: map
@@ -35,7 +35,7 @@ mapping:
     type: int
   "flash":
     type: int
-  "sanitycheck":
+  "twister":
     type: bool
   "supported":
     type: seq