net/mlx5e: en_accel, Add missing net/geneve.h include

The cited commit relies on include <net/geneve.h> being included
implicitly prior to include "en_accel/en_accel.h".
This mandates that all files that needs to include en_accel.h
to redantantly include net/geneve.h.

Include net/geneve.h explicitly at "en_accel/en_accel.h" to avoid
undesired constrain as above.

Fixes: e3cfc7e6b7 ("net/mlx5e: TX, Add geneve tunnel stateless offload support")
Signed-off-by: Raed Salem <raeds@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/en_accel.h

@@ -42,6 +42,8 @@
 #include "en/txrx.h"
 
 #if IS_ENABLED(CONFIG_GENEVE)
+#include <net/geneve.h>
+
 static inline bool mlx5_geneve_tx_allowed(struct mlx5_core_dev *mdev)
 {
 	return mlx5_tx_swp_supported(mdev);