mb/google/poppy/variants/atlas: enable NVMe

This adds support for a x2 NVMe device on PCIe bus PCIe lines 5+6 and
clock#4.

BUG=b:113369699
TEST=booted on atlas

Change-Id: I08e7c4d65662ddbb7d936915c896eb1fcb240ba8
Signed-off-by: Caveh Jalali <caveh@chromium.org>
Reviewed-on: https://review.coreboot.org/28535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2 files changed