tree; Remove unused <lib.h>

Change-Id: Ifa5c89aad7d0538c556665f8b4372e44cf593822
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80433
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/amd/pi/00730F01/northbridge.c

@@ -13,7 +13,6 @@
 #include <device/pci_ids.h>
 #include <string.h>
 #include <stdlib.h>
-#include <lib.h>
 #include <cpu/x86/mp.h>
 #include <Porting.h>
 #include <Topology.h>