drivers: ethernet: stm32: Remove deprecated API support on impacted series

In release V3.3 new STM32Cube HAL ethernet API was added to STM32 ethernet
driver for STM32F4, STM32F7 and STM32H7 series. At the same time, the
legacy API was deprecated for these series.
I'm now fully removing the legacy API support for these series.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>