fix(script): fix CI break by allowing to use del in variable name

Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>

gen/gen_mpy.py

@@ -217,7 +217,7 @@ def function_prototype(func):
 
 # Prevent identifier names which are Python reserved words (add underscore in such case)
 def sanitize(id, kwlist =
-        ['False', 'None', 'True', 'and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else',
+        ['False', 'None', 'True', 'and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'elif', 'else',
          'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or',
          'pass', 'raise', 'return', 'try', 'while', 'with', 'yield']):
     if id in kwlist: