vboot2: Always enable timestamps

The vboot2 code requires them.

Change-Id: I9afaf9b373297b0eebce9ffd7cc05766dee7d6fd
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10006
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/vendorcode/google/chromeos/vboot2/Kconfig

@@ -20,6 +20,7 @@ config VBOOT2_VERIFY_FIRMWARE
 	bool "Firmware Verification with vboot2"
 	default n
 	depends on CHROMEOS && HAVE_HARD_RESET
+	select COLLECT_TIMESTAMPS
 	help
 	  Enabling VBOOT2_VERIFY_FIRMWARE will use vboot2 to verify the romstage
 	  and boot loader.