libpayload/storage/ahci: Use pacc pointer to read device class

The PCI bus gets already scanned while gathering system information.
Therefore, use the pacc pointer from sysinfo_t to read the device class
of PCI devices instead of rescanning the bus.

Change-Id: I4c79e71777e718f5065107ebf780ca9fdb4f1b0c
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46416
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

payloads/libpayload/include/storage/ahci.h

@@ -29,6 +29,6 @@
 #ifndef _STORAGE_AHCI_H
 #define _STORAGE_AHCI_H
 
-void ahci_initialize(void);
+void ahci_initialize(pcidev_t dev);
 
 #endif