vendorcode/siemens: Add LegacyDelay to hwilib

Add a new parameter to hwilib called LegacyDelay. It will be used to
define a delay time to wait for legacy devices if coreboot is too fast
for old and slow onboard devices.

Change-Id: Id0386fdea0ecfb3c1ff6ec1c456071246529950a
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/21517
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2 files changed