Bender: Add pulp_clock_gating_async for compatibility (#8)

Author: micprog

Bender.yml

@@ -37,3 +37,4 @@ sources:
   - target: test
     files:
       - test/tb_tc_sram.sv
+  - src/deprecated/pulp_clock_gating_async.sv

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Fixed
+-`Bender:` Add deprecated `pulp_clock_gating_async` for compatibility to `udma_core`.
 
 ## 0.2.1 - 2020-06-23
 ### Added