ich_descriptors: Modify limits for C620/Lewisburg PCH

Change-Id: Ic8adc4b87993e65096166fa6d665432697070b4c
Signed-off-by: David Hendricks <dhendricks@fb.com>
Reviewed-on: https://review.coreboot.org/20936
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed