net/mlx5: Fix size field in bufferx_reg struct

According to HW spec the field "size" should be 16 bits
in bufferx register.

Fixes: e281682 ("net/mlx5_core: HW data structs/types definitions cleanup")
Signed-off-by: Mohammad Kabat <mohammadkab@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

include/linux/mlx5/mlx5_ifc.h

@@ -9900,8 +9900,8 @@ struct mlx5_ifc_bufferx_reg_bits {
  u8 reserved_at_0[0x6];
  u8 lossy[0x1];
  u8 epsb[0x1];
- u8 reserved_at_8[0xc];
- u8 size[0xc];
+ u8 reserved_at_8[0x8];
+ u8 size[0x10];
 
  u8 xoff_threshold[0x10];
  u8 xon_threshold[0x10];