debugger: change default request type to attach

Author: umbynos

platform.txt

@@ -139,4 +139,5 @@ debug.cortex-debug.custom.postAttachCommands.2=monitor gdb_sync
 debug.cortex-debug.custom.postAttachCommands.3=c
 debug.cortex-debug.custom.overrideRestartCommands.0=monitor reset halt
 debug.cortex-debug.custom.overrideRestartCommands.1=monitor gdb_sync
-debug.cortex-debug.custom.overrideRestartCommands.2=c
+debug.cortex-debug.custom.overrideRestartCommands.2=c
+debug.cortex-debug.custom.request=attach