Clean up Kconfig

- move VGA handling options into devices/Kconfig
- make Devices a top level menu
- move some  options "closer" to the code they control

Change-Id: Ia79541d18b2b0d9b89a8b154255e312060627c48
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1840
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/drivers/pc80/Kconfig

@@ -14,3 +14,11 @@ config DRIVERS_PS2_KEYBOARD
 	  If you know you will only use a payload which does not require
 	  this option, then you can say N here to speed up boot time.
 	  Otherwise say Y.
+
+config TPM
+	bool
+	default n
+	help
+	  Enable this option to enable TPM support in coreboot.
+
+	  If unsure, say N.