drivers: ethernet: phy: Add Microchip's LAN867X Rev.C1/C2 PHY support

Add support for LAN8670/1/2 Rev.C2 as per the latest configuration note
AN1699 released (Revision E (DS60001699F - June 2024)) for Rev.C1 is also
applicable for Rev.C2. Refer hardware revisions list in the latest AN1699
Revision E (DS60001699F - June 2024).
https://www.microchip.com/en-us/application-notes/an1699



Signed-off-by: Parthiban Veerasooran <parthiban.veerasooran@microchip.com>