configs: stm32mp15: activate CMD_IMPORTENV

Activate CONFIG_CMD_IMPORTENV to accept the command "env import".
This command is useful in script to include some variable.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>

configs/stm32mp15_basic_defconfig

@@ -32,7 +32,6 @@ CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 # CONFIG_CMD_ELF is not set
 # CONFIG_CMD_EXPORTENV is not set
-# CONFIG_CMD_IMPORTENV is not set
 CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MEMTEST=y

configs/stm32mp15_trusted_defconfig

@@ -16,7 +16,6 @@ CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_CMD_ADTIMG=y
 # CONFIG_CMD_ELF is not set
 # CONFIG_CMD_EXPORTENV is not set
-# CONFIG_CMD_IMPORTENV is not set
 CONFIG_CMD_ERASEENV=y
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MEMTEST=y