clocksource: Use a plain u64 instead of cycle_t

There is no point in having an extra type for extra confusion. u64 is
unambiguous.

Conversion was done with the following coccinelle script:

@rem@
@@
-typedef u64 cycle_t;

@fix@
typedef cycle_t;
@@
-cycle_t
+u64

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: John Stultz <john.stultz@linaro.org>

drivers/net/ethernet/mellanox/mlx4/main.c

@@ -1823,10 +1823,10 @@ static void unmap_bf_area(struct mlx4_dev *dev)
 		io_mapping_free(mlx4_priv(dev)->bf_mapping);
 }
 
-cycle_t mlx4_read_clock(struct mlx4_dev *dev)
+u64 mlx4_read_clock(struct mlx4_dev *dev)
 {
 	u32 clockhi, clocklo, clockhi1;
-	cycle_t cycles;
+	u64 cycles;
 	int i;
 	struct mlx4_priv *priv = mlx4_priv(dev);