configs: sandbox: activate command env select and env load

Add support of environment location with the new env command:
'env select' and 'env load'

The ENV backend is selected by priority order
- 0 = "nowhere" (default at boot)
- 1 = "EXT4"

To test EXT4 env support, this backend is selected by name:
> env select EXT4

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/configs/sandbox64_defconfig b/configs/sandbox64_defconfig
index 9a16621..8a14285 100644
--- a/configs/sandbox64_defconfig
+++ b/configs/sandbox64_defconfig
@@ -31,6 +31,8 @@
 CONFIG_CMD_ENV_FLAGS=y
 CONFIG_CMD_NVEDIT_EFI=y
 CONFIG_CMD_NVEDIT_INFO=y
+CONFIG_CMD_NVEDIT_LOAD=y
+CONFIG_CMD_NVEDIT_SELECT=y
 CONFIG_LOOPW=y
 CONFIG_CMD_MD5SUM=y
 CONFIG_CMD_MEMINFO=y
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 09b6dcb..0fce901 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -36,6 +36,8 @@
 CONFIG_CMD_ENV_FLAGS=y
 CONFIG_CMD_NVEDIT_EFI=y
 CONFIG_CMD_NVEDIT_INFO=y
+CONFIG_CMD_NVEDIT_LOAD=y
+CONFIG_CMD_NVEDIT_SELECT=y
 CONFIG_LOOPW=y
 CONFIG_CMD_MD5SUM=y
 CONFIG_CMD_MEMINFO=y
diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index c76c0e8..e91e9de 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -25,6 +25,8 @@
 CONFIG_CMD_ASKENV=y
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_NVEDIT_INFO=y
+CONFIG_CMD_NVEDIT_LOAD=y
+CONFIG_CMD_NVEDIT_SELECT=y
 CONFIG_LOOPW=y
 CONFIG_CMD_MD5SUM=y
 CONFIG_CMD_MEMINFO=y
diff --git a/configs/sandbox_spl_defconfig b/configs/sandbox_spl_defconfig
index 85a3e9c..5298b78 100644
--- a/configs/sandbox_spl_defconfig
+++ b/configs/sandbox_spl_defconfig
@@ -37,6 +37,8 @@
 CONFIG_CMD_ENV_CALLBACK=y
 CONFIG_CMD_ENV_FLAGS=y
 CONFIG_CMD_NVEDIT_INFO=y
+CONFIG_CMD_NVEDIT_LOAD=y
+CONFIG_CMD_NVEDIT_SELECT=y
 CONFIG_LOOPW=y
 CONFIG_CMD_MD5SUM=y
 CONFIG_CMD_MEMINFO=y