net: phy: dp83867: Remove unnecessary (void*) conversions

Pointer variables of void * type do not require type cast.

Signed-off-by: wuych <yunchuan@nfschina.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20230424101550.664319-1-yunchuan@nfschina.com


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