configs: stm32mp25: Enable OF_BOARD_FIXUP flag

Enable OF_BOARD_FIXUP.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Change-Id: I9db805328bddd720e2c6d30ee5dee439d05c4a7d
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/u-boot/+/382107
ACI: CIBUILD <MDG-smet-aci-builds@list.st.com>
ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com>

Author: Patrice Chotard

configs/stm32mp25_defconfig

@@ -14,6 +14,7 @@ CONFIG_CMD_STM32PROG=y
 CONFIG_SYS_LOAD_ADDR=0x84000000
 CONFIG_ENV_ADDR=0x60900000
 CONFIG_FWU_NUM_IMAGES_PER_BANK=1
+CONFIG_OF_BOARD_FIXUP=y
 CONFIG_SYS_MEMTEST_START=0x84000000
 CONFIG_SYS_MEMTEST_END=0x88000000
 CONFIG_DISTRO_DEFAULTS=y