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/lpe.c b/src/soc/intel/braswell/lpe.c
index 4662b43..40bda12 100644
--- a/src/soc/intel/braswell/lpe.c
+++ b/src/soc/intel/braswell/lpe.c
@@ -44,7 +44,7 @@
 #define FIRMWARE_REG_BASE_C0 0x144000
 #define FIRMWARE_REG_LENGTH_C0 (FIRMWARE_REG_BASE_C0 + 4)
 
-static void assign_device_nvs(device_t dev, u32 *field, unsigned index)
+static void assign_device_nvs(device_t dev, u32 *field, unsigned int index)
 {
 	struct resource *res;