configs: stm32: Enable DOS_PARTITION for STM32F4/F7 boards

Enable DOS_PARTITION for boards STM32F429-eval, STM32F469-disco
and STM32F746-disco.
This allows to read FAT partition on mmc.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

configs/stm32f429-evaluation_defconfig

@@ -24,7 +24,6 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
-# CONFIG_DOS_PARTITION is not set
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 # CONFIG_BLK is not set

configs/stm32f469-discovery_defconfig

@@ -24,7 +24,6 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
-# CONFIG_DOS_PARTITION is not set
 CONFIG_OF_CONTROL=y
 CONFIG_OF_EMBED=y
 # CONFIG_BLK is not set

configs/stm32f746-disco_defconfig

@@ -34,7 +34,7 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
-# CONFIG_DOS_PARTITION is not set
+# CONFIG_SPL_DOS_PARTITION is not set
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_OF_CONTROL=y
 CONFIG_NET_RANDOM_ETHADDR=y