ARM: stm32: Align mtdparts with SPI NOR layout on DHSOM

The DHSOM uses different SPI NOR layout than the ST devkit, stop
pulling in the ST specific runtime mtdparts settings and adjust
the mtdparts accordingly.

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 bc73162..db5e640 100644
--- a/configs/stm32mp15_dhcom_basic_defconfig
+++ b/configs/stm32mp15_dhcom_basic_defconfig
@@ -61,6 +61,8 @@
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_MTDPARTS=y
+CONFIG_MTDIDS_DEFAULT="nor0=nor0"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=nor0:256k(fsbl1),256k(fsbl2),1408k(uboot),64k(env1),64k(env2)"
 # CONFIG_SPL_DOS_PARTITION is not set
 # CONFIG_ISO_PARTITION is not set
 # CONFIG_SPL_PARTITION_UUIDS is not set
@@ -102,7 +104,6 @@
 CONFIG_STM32_SDMMC2=y
 CONFIG_MTD=y
 CONFIG_DM_MTD=y
-CONFIG_SYS_MTDPARTS_RUNTIME=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=50000000
 CONFIG_SPI_FLASH_SFDP_SUPPORT=y