drivers/spi/eon: Add EN25Q64

chip found in X230 if not using hardware sequencing.

Change-Id: I6ded10d35bfdbbe3d54c4170dd7846c7833f5ff7
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4616
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

src/drivers/spi/eon.c

@@ -21,6 +21,7 @@
 #define CMD_EN25Q128_DP		0xb9    /* Deep Power-down */
 #define CMD_EN25Q128_RES	0xab    /* Release from DP, and Read Signature */
 
+#define EON_ID_EN25Q64		0x17
 #define EON_ID_EN25Q128		0x18
 
 struct eon_spi_flash_params {
@@ -52,6 +53,14 @@ static const struct eon_spi_flash_params eon_spi_flash_table[] = {
 		.nr_sectors = 4096,
 		.name = "EN25Q128",
 	},
+	{
+		.idcode1 = EON_ID_EN25Q64,
+		.page_size = 256,
+		.pages_per_sector = 16,
+		.sectors_per_block = 16,
+		.nr_sectors = 2048,
+		.name = "EN25Q64",
+	},
 };
 
 static int eon_write(struct spi_flash *flash,