test: env: Add test framework for env

Add a new "env" subcommand to the ut command.

This will run unit tests on the env code. This should be targetable to
any device that supports the env features needed for the tests.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/env/Kconfig b/test/env/Kconfig
new file mode 100644
index 0000000..ff16413
--- /dev/null
+++ b/test/env/Kconfig
@@ -0,0 +1,8 @@
+config UT_ENV
+	bool "Enable env unit tests"
+	depends on UNIT_TEST
+	help
+	  This enables the 'ut env' command which runs a series of unit
+	  tests on the env code.
+	  If all is well then all tests pass although there will be a few
+	  messages printed along the way.