[syntacore] tools/syntacore: add N extension registers to IDE cloack

* `N` extension is removed from RISC-V priveleged spec from 1.11 (covers
  `sedeleg`, `sideleg`).

* While I didn't find the exact spec version where `uscratchcsw`,
  `uscratchcswl` were removed, it seems like there are also a part of
  the deprecated N extension (from the simularity to `uscratch`).

Change-Id: Ife9db04be0644083633a902e0b1513780c9eb0d2
Signed-off-by: Evgeniy Naydanov <[email protected]>

Author: en-sc

tools/syntacore/ide_cloak.tcl

@@ -105,6 +105,10 @@ proc generateIdeCloak { } {
     vtype \
     vxrm \
     vxsat \
+    sedeleg \
+    sideleg \
+    uscratchcsw \
+    uscratchcswl \
   ]
 
   set CSRS_TO_HIDE [generateListOfCloakedAddresses $IDE_CSRS]