ARM: stm32: Enable DFU MTD support on DHSOM

All the STM32MP1 based DHSOM have SPI NOR from which they boot,
enable DFU_MTD support to make it possible to expose that SPI NOR
via the DFU.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/configs/stm32mp15_dhcom_basic_defconfig b/configs/stm32mp15_dhcom_basic_defconfig
index 17907da..cb5b2cb 100644
--- a/configs/stm32mp15_dhcom_basic_defconfig
+++ b/configs/stm32mp15_dhcom_basic_defconfig
@@ -81,6 +81,7 @@
 CONFIG_STM32_ADC=y
 CONFIG_SPL_BLOCK_CACHE=y
 CONFIG_DFU_MMC=y
+CONFIG_DFU_MTD=y
 CONFIG_DFU_RAM=y
 CONFIG_DFU_VIRT=y
 CONFIG_SET_DFU_ALT_INFO=y
@@ -98,6 +99,7 @@
 CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_STM32_SDMMC2=y
 CONFIG_MTD=y
+CONFIG_DM_MTD=y
 CONFIG_SYS_MTDPARTS_RUNTIME=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH_MACRONIX=y