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)
diff --git a/src/soc/intel/braswell/southcluster.c b/src/soc/intel/braswell/southcluster.c
index 12bc930..4e4d157 100644
--- a/src/soc/intel/braswell/southcluster.c
+++ b/src/soc/intel/braswell/southcluster.c
@@ -330,7 +330,7 @@
 
 static int place_device_in_d3hot(device_t dev)
 {
-	unsigned offset;
+	unsigned int offset;
 
 	printk(BIOS_SPEW, "%s/%s ( %s )\n",
 			__FILE__, __func__, dev_name(dev));