x86/pci: Enable pci root res read out for 32bit too

Should be good for 32bit too.

-v3: cast res->start
-v4: according to Linus, to use %pR instead of cast

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-9-git-send-email-yinghai@kernel.org>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>