bootmode: Get rid of CONFIG_BOOTMODE_STRAPS

With VBOOT_VERIFY_FIRMWARE separated from CHROMEOS, move recovery and
developer mode check functions to vboot. Thus, get rid of the
BOOTMODE_STRAPS option which controlled these functions under src/lib.

BUG=chrome-os-partner:55639

Change-Id: Ia2571026ce8976856add01095cc6be415d2be22e
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15868
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/broadwell/igd.c

@@ -487,8 +487,7 @@ static void igd_init(struct device *dev)
 	/* Wait for any configured pre-graphics delay */
 	if (!acpi_is_wakeup_s3()) {
 #if IS_ENABLED(CONFIG_CHROMEOS)
-		if (developer_mode_enabled() || recovery_mode_enabled() ||
-		    vboot_wants_oprom())
+		if (display_init_required() || vboot_wants_oprom())
 			mdelay(CONFIG_PRE_GRAPHICS_DELAY);
 #else
 		mdelay(CONFIG_PRE_GRAPHICS_DELAY);