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/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 8c9e619..78fbee4 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -35,11 +35,11 @@
 if I2C
 
 config I2C_BOARDINFO
-	boolean
+	bool
 	default y
 
 config I2C_COMPAT
-	boolean "Enable compatibility bits for old user-space"
+	bool "Enable compatibility bits for old user-space"
 	default y
 	help
 	  Say Y here if you intend to run lm-sensors 3.1.1 or older, or any