nds32: drop it, together with aice adapter driver

The target nds32 and its companion adapter aice have not received
any real improvement since 2013.
It has been hard to keep them aligned during the evolution of
OpenOCD code, with no way for maintainers to really check if they
are still working.
No real documentation is present for them in OpenOCD.
The nds32 code triggers ~50 errors/warnings with scan-build.

The arch nds32 has been dropped from Linux kernel v5.18-rc1.

For all the reasons above, this code has been deprecated with
commit 2e5df83de7 ("nds32: deprecate it, together with aice
adapter driver") and tagged to be dropped before v0.13.0.

Let it r.i.p. in OpenOCD git history.

While there, drop from checkpatch list the camelcase symbols that
where only used in this code.

Change-Id: Ide52a217f2228e9da2f1cc5036c48f3536f26952
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7382
Tested-by: jenkins

tcl/interface/nds32-aice.cfg

@@ -1,17 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-or-later
-
-#
-# Andes AICE
-#
-# http://www.andestech.com
-#
-
-adapter driver aice
-aice desc "Andes AICE adapter"
-# adapter serial "C001-42163"
-aice vid_pid 0x1CFC 0x0000
-aice port aice_usb
-reset_config trst_and_srst
-adapter speed 24000
-aice retry_times 50
-aice count_to_check_dbger 30