xea: defconfig: Update defconfig to support mtd partitions r/w by name

After this change it would be possible to use 'mtd' command to get access
to XEA's SPI-NOR partitions by name (e.g. SPL), not by offsets.

To enable this feature the CONFIG_SPI_FLASH_MTD needs to be defined in the
Kconfig, not in xea.h.

=> mtd list
=> mtd read spl-boot-data1 ${loadaddr} 0x0 4
=> md.l ${loadaddr} 1

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/imx28_xea_defconfig b/configs/imx28_xea_defconfig
index 8ded0a9..4273b4b 100644
--- a/configs/imx28_xea_defconfig
+++ b/configs/imx28_xea_defconfig
@@ -65,8 +65,6 @@
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_CMD_MTDPARTS=y
-CONFIG_MTDIDS_DEFAULT="nor0=spi3.0"
-CONFIG_MTDPARTS_DEFAULT="spi3.0:64k(SPL),448k(uboot),128k(envs),384k(unused1),4096k(kernel),8192k(swupdate),-(unused2)"
 CONFIG_DOS_PARTITION=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
@@ -84,6 +82,7 @@
 CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_MMC_MXS=y
 CONFIG_MTD=y
+CONFIG_DM_MTD=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_BUS=3
 CONFIG_SF_DEFAULT_SPEED=40000000
@@ -92,6 +91,7 @@
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_STMICRO=y
 # CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
+CONFIG_SPI_FLASH_MTD=y
 CONFIG_PHYLIB=y
 CONFIG_PHY_ADDR_ENABLE=y
 CONFIG_PHY_ADDR=1