Fix 'unsigned int' to bare use of 'unsigned'

Change-Id: Iee09b601045d7785a0977a4f7ed7385b1d311044
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31913
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/northbridge/intel/sandybridge/gma.c

@@ -300,7 +300,7 @@ static inline void gtt_write_powermeter(const struct gt_powermeter *pm)
 #define GTT_RETRY 1000
 int gtt_poll(u32 reg, u32 mask, u32 value)
 {
-	unsigned try = GTT_RETRY;
+	unsigned int try = GTT_RETRY;
 	u32 data;
 
 	while (try--) {