userspace: proxy: Fix typo in variable name

Fix typo in variable name from heap_part_cached to heap_cached_part.

Fixes thesofproject#10431

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Author: softwarecki

src/audio/module_adapter/library/userspace_proxy.c

@@ -74,7 +74,7 @@ static int userspace_proxy_memory_init(struct userspace_context *user,
 
 	struct k_mem_partition *parts_ptr[] = {
 #ifdef HEAP_PART_CACHED
-		&heap_part_cached,
+		&heap_cached_part,
 #endif
 		&heap_part
 	};