Comment 13 for bug 1759893

From the KConfig tutorial: https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt

- reverse dependencies: "select" <symbol> ["if" <expr>]
  While normal dependencies reduce the upper limit of a symbol (see
  below), reverse dependencies can be used to force a lower limit of
  another symbol. The value of the current menu symbol is used as the
  minimal value <symbol> can be set to. If <symbol> is selected multiple
  times, the limit is set to the largest selection.
  Reverse dependencies can only be used with boolean or tristate
  symbols.
  Note:
 *select should be used with care.* select will force
 a symbol to a value without visiting the dependencies.
 By abusing select you are able to select a symbol FOO even
 if FOO depends on BAR that is not set.
 In general use select only for non-visible symbols
 (no prompts anywhere) and for symbols with no dependencies.
 That will limit the usefulness but on the other hand avoid
 the illegal configurations all over.