at32: update platform, use atlink

Author: bkleiner

platformio.ini

@@ -165,9 +165,9 @@ extends = stm32g473
 
 [at32]
 extends = common
-debug_tool = stlink
+debug_tool = atlink
 upload_protocol = dfu
-platform = https://github.com/ArteryTek/platform-arterytekat32.git#5729d36
+platform = https://github.com/ArteryTek/platform-arterytekat32.git#c8da386
 platform_packages = toolchain-gccarmnoneeabi@~1.120301.0
 framework = at32firmlib
 board_build.at32firmlib.custom_system_setup = yes