nds32: support Andes profiling function

Change-Id: Ibc45ec5777d6841956c02de6b4ae8e74c2a6de37
Signed-off-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-on: http://openocd.zylin.com/1585
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/target/nds32_v3.c

@@ -523,4 +523,6 @@ struct target_type nds32_v3_target = {
 
 	.get_gdb_fileio_info = nds32_get_gdb_fileio_info,
 	.gdb_fileio_end = nds32_gdb_fileio_end,
+
+	.profiling = nds32_profiling,
 };