Added missing U(S)ART DMA traits for HAL serial types

Author: HelloWorldTeraByte

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
  - Improve SPI::new* docs [#587]
  - Add advanced timer dead time insertion example [#585]
+ - Added missing U(S)ART DMA traits for HAL serial types [#593]
 
 ## [v0.15.0] - 2023-03-13