configs: stm32mp1: activate OF_LIVE for DT live support

Activate the live DT to reduce the DT parsing time.

For example the boot time is reduced by 200ms on STM32MP157C-EV1 board
for stm32mp15_basic_defconfig (boot with SPL) or
stm32mp15_trusted_defconfig (boot with TF-A).

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index 9ad7c3a..d3e5775 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -58,6 +58,7 @@
 CONFIG_CMD_LOG=y
 CONFIG_CMD_UBI=y
 # CONFIG_SPL_DOS_PARTITION is not set
+CONFIG_OF_LIVE=y
 CONFIG_OF_SPL_REMOVE_PROPS="interrupts interrupt-names interrupts-extended interrupt-controller \\\#interrupt-cells interrupt-parent dmas dma-names assigned-clocks assigned-clock-rates assigned-clock-parents hwlocks"
 CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_MMC=y