expo: Move cedit test into its own file and tidy

Move this test out so it can have its own file. Rename the test to use
a cedit_ prefix.

This allows us to drop the check for CONFIG_CMD_CEDIT in the test.

Also we don't need driver model objects for this test, so drop them.

Signed-off-by: Simon Glass <sjg@chromium.org>
3 files changed