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>
10 files changed