Make erasure matrix type not optional choose automatically

Remove option of providing Technique and handling errors based on that
choose a matrix type automatically based on number of data blocks.

INTEL recommends on using cauchy for consistent invertible matrices,
while vandermonde is faster we should default to cauchy for large
data blocks.

pkg/erasure/ec_minio_encode.c

@@ -17,16 +17,14 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#include "ec_isal-l.h"
+#include "ec.h"
 #include "ec_minio_common.h"
 
 /*
   Generate encode matrix during the encoding phase
 */
 
-int32_t minio_init_encoder (int technique, int k, int m,
-                            unsigned char **encode_matrix,
-                            unsigned char **encode_tbls)
+int32_t minio_init_encoder (int k, int m, unsigned char **encode_matrix, unsigned char **encode_tbls)
 {
         unsigned char *tmp_matrix;
         unsigned char *tmp_tbls;
@@ -34,7 +32,7 @@ int32_t minio_init_encoder (int technique, int k, int m,
         tmp_matrix = (unsigned char *) malloc (k * (k + m));
         tmp_tbls = (unsigned char *) malloc (k * (k + m) * 32);
 
-	if (technique == 0) {
+        if (k < 5) {
                 /*
                   Commonly used method for choosing coefficients in erasure
                   encoding but does not guarantee invertable for every sub
@@ -44,7 +42,7 @@ int32_t minio_init_encoder (int technique, int k, int m,
                   -- Intel
                 */
 		gf_gen_rs_matrix (tmp_matrix, k + m, k);
-	} else if (technique == 1) {
+        } else {
 		gf_gen_cauchy1_matrix (tmp_matrix, k + m, k);
         }