configs: stm32mp1: enable the fastboot oem command format

Enable the fastboot oem command format and set the variable
"partitions" with default eMMC partitions list.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Jean-Philippe ROMAIN <jean-philippe.romain@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index b816f26..9c207d0 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -84,6 +84,7 @@
 CONFIG_FASTBOOT_MMC_BOOT2_NAME="mmc1boot1"
 CONFIG_FASTBOOT_MMC_USER_SUPPORT=y
 CONFIG_FASTBOOT_MMC_USER_NAME="mmc1"
+CONFIG_FASTBOOT_CMD_OEM_FORMAT=y
 CONFIG_GPIO_HOG=y
 CONFIG_DM_HWSPINLOCK=y
 CONFIG_HWSPINLOCK_STM32=y