{northbridge, soc, southbridge}/intel: Make use of pci_dev_set_subsystem()

This patch removes local definitions of sub_system function and make use
of common function pci_dev_set_subsystem().

Change-Id: I91982597fdf586ab514bec3d8e4d09f2565fe56d
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31982
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: David Guckian
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/southbridge/intel/i82801jx/usb_ehci.c b/src/southbridge/intel/i82801jx/usb_ehci.c
index 543ac57..a4f5a01 100644
--- a/src/southbridge/intel/i82801jx/usb_ehci.c
+++ b/src/southbridge/intel/i82801jx/usb_ehci.c
@@ -44,13 +44,7 @@
 	/* Enable writes to protected registers. */
 	pci_write_config8(dev, 0x80, access_cntl | 1);
 
-	if (!vendor || !device) {
-		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
-				pci_read_config32(dev, PCI_VENDOR_ID));
-	} else {
-		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
-				((device & 0xffff) << 16) | (vendor & 0xffff));
-	}
+	pci_dev_set_subsystem(dev, vendor, device);
 
 	/* Restore protection. */
 	pci_write_config8(dev, 0x80, access_cntl);