configs: migrate CONFIG_SYS_MTDPARTS_RUNTIME to defconfigs

Move CONFIG_SYS_MTDPARTS_RUNTIME into Kconfig done by moveconfig.py.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index d42153a..a9b996c 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -88,6 +88,7 @@
 CONFIG_STM32_SDMMC2=y
 CONFIG_MTD=y
 CONFIG_DM_MTD=y
+CONFIG_SYS_MTDPARTS_RUNTIME=y
 CONFIG_MTD_RAW_NAND=y
 CONFIG_NAND_STM32_FMC2=y
 CONFIG_MTD_SPI_NAND=y