Change PPCG4 CGEMM_M to match kernel change

Author: martin-frbg

param.h

@@ -1974,7 +1974,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define SGEMM_DEFAULT_UNROLL_N 4
 #define DGEMM_DEFAULT_UNROLL_M 4
 #define DGEMM_DEFAULT_UNROLL_N 4
-#define CGEMM_DEFAULT_UNROLL_M 8
+#define CGEMM_DEFAULT_UNROLL_M 2
 #define CGEMM_DEFAULT_UNROLL_N 2
 #define ZGEMM_DEFAULT_UNROLL_M 2
 #define ZGEMM_DEFAULT_UNROLL_N 2