libpayload/arch/x86: Introduce pacc pointer in sysinfo_t struct

Currently, the PCI bus gets scanned multiple times for various reasons
(e.g. to read the device class). Therefore, and in preparation to
CB:46416, introduce the pacc pointer in the sysinfo_t struct and scan
the PCI bus while gathering system information.

Change-Id: I496c5a3d78c7fb5d7c9f119a0c9a0314d54e729f
Signed-off-by: Felix Singer <felix.singer@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46348
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

payloads/libpayload/arch/x86/sysinfo.c

@@ -78,5 +78,10 @@ int lib_get_sysinfo(void)
 		lib_sysinfo.memrange[1].type = CB_MEM_RAM;
 	}
 
+#if CONFIG(LP_PCI)
+	pci_init(&lib_sysinfo.pacc);
+	pci_scan_bus(&lib_sysinfo.pacc);
+#endif
+
 	return ret;
 }