Don't add CmdlineChecks in add_kconfig_checks() to avoid wrong results
when the tool doesn't check the cmdline.

A common pattern for checking the 'param_x' cmdline parameter
that __overrides__ the 'PARAM_X_DEFAULT' kconfig option:
  l += [OR(CmdlineCheck(reason, decision, 'param_x', '1'),
           AND(KconfigCheck(reason, decision, 'PARAM_X_DEFAULT_ON', 'y'),
               CmdlineCheck(reason, decision, 'param_x, 'is not set')))]

Here we don't check the kconfig options or minimal kernel version
required for the cmdline parameters. That would make the checks
very complex and not give a 100% guarantee anyway.