net: stmmac: Don't include dwmac4 definitions in stmmac_ptp

The stmmac_ptp code doesn't need the dwmac4 register definitions, remove
the inclusion.

Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20241112170658.2388529-8-maxime.chevallier@bootlin.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>