kconfig: the day kconfig warns about "select"-abuse has come

CC: catalin.marinas@arm.com
Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

Documentation/kbuild/kconfig-language.txt

@@ -112,7 +112,6 @@ applicable everywhere (see syntax).
 	(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.
-	kconfig should one day warn about such things.
 
 - numerical ranges: "range" <symbol> <symbol> ["if" <expr>]
   This allows to limit the range of possible input values for int