soft_aes: fix previous optimization

Previously removed unrolled variant is faster on some CPUs
Some CPUs are faster with added unrolled variant
The best variant depends on number of threads on some CPUs

src/crypto/randomx/aes_hash.hpp

@@ -30,6 +30,17 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <cstddef>
 
+typedef void (hashAndFillAes1Rx4_impl)(void *scratchpad, size_t scratchpadSize, void *hash, void* fill_state);
+
+extern hashAndFillAes1Rx4_impl* softAESImpl;
+
+inline hashAndFillAes1Rx4_impl* GetSoftAESImpl()
+{
+  return softAESImpl;
+}
+
+void SelectSoftAESImpl(size_t threadsCount);
+
 template<int softAes>
 void hashAes1Rx4(const void *input, size_t inputSize, void *hash);
 
@@ -39,5 +50,5 @@ void fillAes1Rx4(void *state, size_t outputSize, void *buffer);
 template<int softAes>
 void fillAes4Rx4(void *state, size_t outputSize, void *buffer);
 
-template<int softAes>
+template<int softAes, int unroll>
 void hashAndFillAes1Rx4(void *scratchpad, size_t scratchpadSize, void *hash, void* fill_state);