net/mlx5: make the symbol 'ESW_POOLS' static

Fix the following sparse warning:
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c:35:20: warning: symbol 'ESW_POOLS' was not declared. Should it be static?

Fixes: 39ac237c ("net/mlx5: E-Switch, Refactor chains and priorities")
Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Acked-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -32,7 +32,7 @@
  * pools.
  */
 #define ESW_SIZE (16 * 1024 * 1024)
-const unsigned int ESW_POOLS[] = { 4 * 1024 * 1024,
+static const unsigned int ESW_POOLS[] = { 4 * 1024 * 1024,
 					  1 * 1024 * 1024,
 					  64 * 1024,
 					  4 * 1024, };