Revert "kv-cache : split implementation in separate sources (ggml-org#13920)"

This reverts commit 0fc16b4.

Author: shefben

src/CMakeLists.txt

@@ -21,9 +21,6 @@ add_library(llama
             llama-impl.cpp
             llama-io.cpp
             llama-kv-cache.cpp
-            llama-kv-cache-unified.cpp
-            llama-kv-cache-unified-iswa.cpp
-            llama-kv-cache-recurrent.cpp
             llama-memory.cpp
             llama-mmap.cpp
             llama-model-loader.cpp

src/llama-graph.cpp

@@ -3,10 +3,7 @@
 #include "llama-impl.h"
 #include "llama-batch.h"
 #include "llama-cparams.h"
-
-#include "llama-kv-cache-unified.h"
-#include "llama-kv-cache-unified-iswa.h"
-#include "llama-kv-cache-recurrent.h"
+#include "llama-kv-cache.h"
 
 #include <cassert>
 #include <cmath>