Remove Kconfig variable that has no effect

MAINBOARD_HAS_BOOTBLOCK_INIT is only declared once and selected elsewhere
(with no overlap), and never read. Remove it.

Change-Id: Ica1f16182b556dbf4a3b747237af74bcc4c0608c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10254
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)

src/mainboard/google/veyron_danger/Kconfig

@@ -28,7 +28,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select HAVE_HARD_RESET
 	select MAINBOARD_DO_NATIVE_VGA_INIT
 	select MAINBOARD_HAS_CHROMEOS
-	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select RAM_CODE_SUPPORT
 	select RETURN_FROM_VERSTAGE
 	select SOC_ROCKCHIP_RK3288