configs: Remove unused WalkCache models

Change-Id: Iebda966e72b484ee15cbc7cd62256a950b2a90f1
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Richard Cooper <richard.cooper@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54244
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/arm/devices.py

@@ -65,17 +65,6 @@ class L1D(L1_DCache):
     write_buffers = 16
 
 
-class WalkCache(PageTableWalkerCache):
-    tag_latency = 4
-    data_latency = 4
-    response_latency = 4
-    mshrs = 6
-    tgts_per_mshr = 8
-    size = '1kB'
-    assoc = 8
-    write_buffers = 16
-
-
 class L2(L2Cache):
     tag_latency = 12
     data_latency = 12