rockchip/rk3288: complete vboot configuration and move to SoC

Where vboot verification can start, and how the code flow looks like is more a
property of the SoC (and its properties, like amount of SRAM) rather than the
board.

Change-Id: I610153ea4ceddc226d8cc3e17a515e41fc0479cf
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10662
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/soc/rockchip/rk3288/Kconfig b/src/soc/rockchip/rk3288/Kconfig
index 1b82515..3a4712e 100644
--- a/src/soc/rockchip/rk3288/Kconfig
+++ b/src/soc/rockchip/rk3288/Kconfig
@@ -31,6 +31,9 @@
 	select UNCOMPRESSED_RAMSTAGE
 	select GENERIC_GPIO_LIB
 	select RTC
+	select VBOOT_STARTS_IN_BOOTBLOCK
+	select SEPARATE_VERSTAGE
+	select RETURN_FROM_VERSTAGE
 
 if SOC_ROCKCHIP_RK3288