intel/haswell: Allow overriding PRE_GRAPHICS_DELAY in config

Without a prompt the config option will always stay 0
due to the way Kconfig works.

BUG=chrome-os-partner:25387
BRANCH=panther
TEST=Boot into dev mode with Mohammed's TV screen, see
     the dev mode screen appear.

Change-Id: Ib7d9ec82b4a4a29daddc29aa7702fc420279017d
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/185970
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Queue: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Reviewed-on: http://review.coreboot.org/6010
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
1 file changed