inteltool/ahci: Don't print reserved, all-zero registers

Behavior matches with other dumps of inteltool.

Change-Id: Id9755d251fc42185c9e8d574deb55c76e129b718
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19585
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed