configs: stm32mp15: activate CMD_EXPORTENV

Activate CONFIG_CMD_EXPORTENV to accept the command "env export".
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>

configs/stm32mp15_basic_defconfig

@@ -31,7 +31,6 @@ CONFIG_SPL_SPI_FLASH_MTD=y
 CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 # CONFIG_CMD_ELF is not set
-# CONFIG_CMD_EXPORTENV is not set
 CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MEMTEST=y

configs/stm32mp15_trusted_defconfig

@@ -15,7 +15,6 @@ CONFIG_BOOTCOMMAND="run bootcmd_stm32mp"
 CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 # CONFIG_CMD_ELF is not set
-# CONFIG_CMD_EXPORTENV is not set
 CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MEMTEST=y