target/arc: add RTT commands

Since RTT is architecture agnostic, add support for using it on
the ARC architecture as well.

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

Diff for: src/target/arc.h

@@ -23,6 +23,7 @@
 #include "target_type.h"
 #include "helper/bits.h"
 #include "smp.h"
+#include "rtt/rtt.h"
 
 #include "arc_jtag.h"
 #include "arc_cmd.h"

Diff for: src/target/arc_cmd.c

@@ -1001,6 +1001,9 @@ const struct command_registration arc_cache_group_handlers[] = {
 		.usage = "",
 		.chain = arc_l2_cache_group_handlers,
 	},
+	{
+		.chain = rtt_target_command_handlers,
+	},
 	COMMAND_REGISTRATION_DONE
 };