net/mlx5: Include linux/pci.h for pci_msix_can_alloc_dyn()

Add include directive to assure pci_msix_can_alloc_dyn() prototype.

Fixes: 3354822 ("net/mlx5: Use dynamic msix vectors allocation")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202303291328.sNmTyyWF-lkp@intel.com/
Signed-off-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Author: elic307i

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

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
 /* Copyright (c) 2019 Mellanox Technologies. */
 
+#include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/notifier.h>
 #include <linux/mlx5/driver.h>