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

src/jtag/startup.tcl

@@ -865,12 +865,6 @@ proc ft232r_restore_serial args {
 	eval ft232r restore_serial $args
 }
 
-lappend _telnet_autocomplete_skip "aice serial"
-proc "aice serial" {args} {
-	echo "DEPRECATED! use 'adapter serial' not 'aice serial'"
-	eval adapter serial $args
-}
-
 lappend _telnet_autocomplete_skip cmsis_dap_serial
 proc cmsis_dap_serial args {
 	echo "DEPRECATED! use 'adapter serial' not 'cmsis_dap_serial'"