vboot: Separate vboot from chromeos

VBOOT_VERIFY_FIRMWARE should be independent of CHROMEOS. This allows use
of verified boot library without having to stick to CHROMEOS.

BUG=chrome-os-partner:55639

Change-Id: Ia2c328712caedd230ab295b8a613e3c1ed1532d9
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15867
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/mainboard/intel/strago/Kconfig

@@ -16,10 +16,10 @@ config BOARD_SPECIFIC_OPTIONS
 	select PCIEXP_L1_SUB_STATE
 
 config CHROMEOS
-	select LID_SWITCH
-	select CHROMEOS_VBNV_CMOS
 	select EC_SOFTWARE_SYNC
+	select LID_SWITCH
 	select VBOOT_DYNAMIC_WORK_BUFFER
+	select VBOOT_VBNV_CMOS
 	select VIRTUAL_DEV_SWITCH
 
 config DYNAMIC_VNN_SUPPORT