net/mlx5: Rename ptp clock info

[ Upstream commit aac2df7f ]

Fix a typo in ptp_clock_info naming: mlx5_p2p -> mlx5_ptp.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Stable-dep-of: fe91d572 ("net/mlx5: Fix ptp max frequency adjustment range")
Signed-off-by: Sasha Levin <sashal@kernel.org>