configs: fix class reference in CacheConfigs

One reference was not properly updated when changing to absolute import paths

Change-Id: Idf330487d5d08d92ebb4489f16d75429f882bd7a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17541
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
diff --git a/configs/common/CacheConfig.py b/configs/common/CacheConfig.py
index ab9d267..35e1473 100644
--- a/configs/common/CacheConfig.py
+++ b/configs/common/CacheConfig.py
@@ -66,7 +66,7 @@
         dcache_class, icache_class, l2_cache_class, walk_cache_class = \
             core.O3_ARM_v7a_DCache, core.O3_ARM_v7a_ICache, \
             core.O3_ARM_v7aL2, \
-            O3_ARM_v7aWalkCache
+            core.O3_ARM_v7aWalkCache
     else:
         dcache_class, icache_class, l2_cache_class, walk_cache_class = \
             L1_DCache, L1_ICache, L2Cache, None