smbios: Mark laptops as such

Change-Id: I179a4cede2f826f72a400208748798737216c01a
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7071
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

src/Kconfig

@@ -236,6 +236,10 @@ config BOOTBLOCK_NORMAL
 
 endchoice
 
+config SYSTEM_TYPE_LAPTOP
+       default n
+       bool
+
 config BOOTBLOCK_SOURCE
 	string
 	default "bootblock_simple.c" if BOOTBLOCK_SIMPLE