Code clean-up using black and flake8

 - No functional change

Signed-off-by: Tim Hall <tim.hall@arm.com>
Change-Id: I5ab1198b9d092cd041fa9b85b2dee9900d299bfc
diff --git a/ethosu/vela/tflite_mapping.py b/ethosu/vela/tflite_mapping.py
index 06097cd..d077768 100644
--- a/ethosu/vela/tflite_mapping.py
+++ b/ethosu/vela/tflite_mapping.py
@@ -260,7 +260,6 @@
     BuiltinOptions.DensifyOptions: DensifyOptions.DensifyOptions,
     BuiltinOptions.DepthToSpaceOptions: DepthToSpaceOptions.DepthToSpaceOptions,
     BuiltinOptions.HardSwishOptions: HardSwishOptions.HardSwishOptions,
-
     BuiltinOptions.IfOptions: IfOptions.IfOptions,
     BuiltinOptions.NonMaxSuppressionV4Options: NonMaxSuppressionV4Options.NonMaxSuppressionV4Options,
     BuiltinOptions.NonMaxSuppressionV5Options: NonMaxSuppressionV5Options.NonMaxSuppressionV5Options,
@@ -536,7 +535,7 @@
             ),
         ),
     ),
-    BuiltinOperator.PRELU : ("Prelu", None),
+    BuiltinOperator.PRELU: ("Prelu", None),
     BuiltinOperator.MAXIMUM: ("Maximum", OptionsSerializer("MaximumMinimumOptions")),
     BuiltinOperator.ARG_MAX: (
         "ArgMax",