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>

drivers/connector/Kconfig

@@ -12,7 +12,7 @@ menuconfig CONNECTOR
 if CONNECTOR
 
 config PROC_EVENTS
-	boolean "Report process events to userspace"
+	bool "Report process events to userspace"
 	depends on CONNECTOR=y
 	default y
 	---help---