soc/intel/braswell: Add int to unsigned

Fix the following warning detected by checkpatch.pl:

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'

TEST=Build for cyan

Change-Id: Ib5c6a1bf5308a8add42d7371854b80ea53d7ae84
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18870
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins)

src/soc/intel/braswell/chip.c

@@ -339,7 +339,8 @@ struct chip_operations soc_intel_braswell_ops = {
 	.init = soc_init,
 };
 
-static void pci_set_subsystem(device_t dev, unsigned vendor, unsigned device)
+static void pci_set_subsystem(device_t dev, unsigned int vendor,
+	unsigned int device)
 {
 	printk(BIOS_SPEW, "%s/%s ( %s, 0x%04x, 0x%04x )\n",
 			__FILE__, __func__, dev_name(dev), vendor, device);