net/mlx5e: Fix timestamping capabilities reporting

Misuse of (BIT) macro caused to report wrong flags for
"Hardware Transmit Timestamp Modes" and "Hardware Receive
Filter Modes"

Fixes: ef9814de

 ('net/mlx5e: Add HW timestamping (TS) support')
Signed-off-by: Maor Dickman <maord@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>