* AT32F435: new target (#12159)
* AT32F435: New target (WIP)
* IO and Timer Updates
* Adding pseudonyms for the STM TypeDef items.
- implementation to follow
* Adding config_streamer support for AT32
* Implementation for IO
* Adding in Peripheral mapping from emsr.
* Warnings cleanup for AT drivers
* Getting things to the linking stage
* Add AT-START-F435 LEDs as default in AT32F435 as a temporary measure to aid bringup
* Remove tabs
* Enable selection of serial port to use for MSP
* Setup defaults for AT-START-F435 to use MSP on UART1
* Fix for most recent 4.5.0 Makefile changes
* Solve for sanity check.
* Add AT32F435 MCU type
* Fix compilation issue with SITL
* Merge conflict resolution
* Minor cleanup
* Adding line feed.
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Co-authored-by: Steve Evans <Steve@SCEvans.com>
