scripts: ci: check_compliance: Add check for disallowed Kconfigs

Adds a check for Kconfig settings that are disallowed from being
used in defconfig files (because it is the complete wrong place
for them), with the default entry being PINCTRL

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>
Co-authored-by: Benjamin Cabé <benjamin@zephyrproject.org>