kconfig: use bool instead of boolean for type definition attributes

Support for keyword 'boolean' will be dropped later on.

No functional change.

Reference: http://lkml.kernel.org/r/cover.1418003065.git.cj@linux.com
Signed-off-by: Christoph Jaeger <cj@linux.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/init/Kconfig b/init/Kconfig
index 9afb971..643b221 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -914,7 +914,7 @@
 	  machine.
 
 menuconfig CGROUPS
-	boolean "Control Group support"
+	bool "Control Group support"
 	select KERNFS
 	help
 	  This option adds support for grouping sets of processes together, for
@@ -1770,7 +1770,7 @@
 	default y
 
 config RT_MUTEXES
-	boolean
+	bool
 
 config BASE_SMALL
 	int