mtd: spi_nor: change message level on macronix detection

Change the detection message from WARN to INFO when macronix
NOR is detected.

Change-Id: I488696f1fb75b823e85decfcd6cd32e7b36a6c2e
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>

drivers/mtd/nor/spi_nor.c

 /*
- * Copyright (c) 2019, STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2019-2020, STMicroelectronics - All Rights Reserved
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -368,7 +368,7 @@ int spi_nor_init(unsigned long long *size, unsigned int *erase_size)
 	if (nor_dev.read_op.data.buswidth == 4U) {
 		switch (id) {
 		case MACRONIX_ID:
-			WARN("Enable Macronix quad support\n");
+			INFO("Enable Macronix quad support\n");
 			ret = spi_nor_macronix_quad_enable();
 			break;
 		case MICRON_ID: