ggml : fix I8MM Q4_1 scaling factor conversion (#10562)

ggml-ci

tests/test-backend-ops.cpp

@@ -3334,7 +3334,9 @@ static const ggml_type all_types[] = {
 
 static const ggml_type base_types[] = {
     GGML_TYPE_F32, GGML_TYPE_F16,
+    GGML_TYPE_Q8_0, // for I8MM tests
     GGML_TYPE_Q4_0,
+    GGML_TYPE_Q4_1, // for I8MM tests
     GGML_TYPE_Q4_K,
     GGML_TYPE_IQ2_XXS
 };