test: improve configuration for Kconfig test options

* Fix dependencies
* Provide labels that are easier to grasp.
* Fix typo %s/whgch/which/
* Fix type %s/Is/is/

Fixes: 29784d62 ("test: Add some tests for kconfig.h")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>