added optimized cscal kernel for sandybridge

kernel/x86_64/KERNEL.SANDYBRIDGE

@@ -1,4 +1,5 @@
 DSCALKERNEL = dscal.c
+CSCALKERNEL = cscal.c
 
 SGERKERNEL = sger.c
 DGERKERNEL = dger.c

kernel/x86_64/cscal.c

@@ -32,6 +32,8 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "cscal_microk_haswell-2.c"
 #elif defined(BULLDOZER)
 #include "cscal_microk_bulldozer-2.c"
+#elif defined(SANDYBRIDGE)
+#include "cscal_microk_bulldozer-2.c"
 #endif