drivers: ethernet: Add API_V2 auto-negotiation support

- Added definitions for LAN8742 PHY registers and bit masks
  to support auto-negotiation.
- The function `eth_init_api_v2` requires the Ethernet interface
  to be properly initialized. In auto-negotiation mode,
  it reads the speed and duplex settings to configure
  the driver accordingly.
- Implemented functions to get link state and configure speed
  and duplex mode based on auto-negotiation results.
- Ensured proper initialization of semaphores and MAC configuration
  for both auto-negotiation enabled and disabled scenarios.

Signed-off-by: IBEN EL HADJ MESSAOUD Marwa <marwa.ibenelhadjmessaoud-ext@st.com>