env: Allow VPL environment to be nowhere

Add an option to put the VPL environment nowhere (not in storage).

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/env/Kconfig b/env/Kconfig
index 6e24eee..2bbe4c4 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -860,6 +860,16 @@
 
 endif
 
+if VPL_ENV_SUPPORT
+
+config VPL_ENV_IS_NOWHERE
+	bool "VPL Environment is not stored"
+	default y if ENV_IS_NOWHERE
+	help
+	  Similar to ENV_IS_NOWHERE, used for VPL environment.
+
+endif  # VPL_ENV_SUPPORT
+
 config USE_BOOTFILE
 	bool "Add a 'bootfile' environment variable"
 	help