fix D66283212 typo

Summary:
Pull Request resolved: #7157

Differential Revision: D66689275

Author: zonglinpeng

backends/arm/TARGETS

@@ -113,7 +113,7 @@ python_library(
 
 python_library(
     name = "arm_model_evaluator",
-    src = [
+    srcs = [
         "util/arm_model_evaluator.py",
     ],
     typing = True,