Nobody defines struct mdio_gpio_platform_data. Remove platform data support from mdio-gpio and drop the header. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com> Link: https://patch.msgid.link/20260316-gpio-mdio-hdr-cleanup-v1-2-2df696f74728@oss.qualcomm.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>