stm32mp1: configs: activate CMD_ERASEENV

Activate the command env erase to reset the environment with the command:
> env erase

it is simpler than:
> env default -a
> env save

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index 4c3bdb6..aa05809 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -30,6 +30,7 @@
 # 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
 CONFIG_SYS_MEMTEST_START=0xc0000000
diff --git a/configs/stm32mp15_trusted_defconfig b/configs/stm32mp15_trusted_defconfig
index 4ca50d6..8db52cb 100644
--- a/configs/stm32mp15_trusted_defconfig
+++ b/configs/stm32mp15_trusted_defconfig
@@ -14,6 +14,7 @@
 # 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
 CONFIG_SYS_MEMTEST_START=0xc0000000