net/mlx5: drop duplicate header delay.h

Drop duplicate header delay.h from mlx5/core/main.c.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Acked-by: Matan Barak <matanb@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/main.c

@@ -46,7 +46,6 @@
 #include <linux/mlx5/srq.h>
 #include <linux/debugfs.h>
 #include <linux/kmod.h>
-#include <linux/delay.h>
 #include <linux/mlx5/mlx5_ifc.h>
 #ifdef CONFIG_RFS_ACCEL
 #include <linux/cpu_rmap.h>