driver: ethernet: Add ethernet driver support for ra6m4 and ra6m5

Add ethernet support for RA6M4, RA6M5.
Add soc script for generating Renesas Partition Data (RFP file).

Signed-off-by: Ta Minh Nhat <nhat-minh.ta.yn@bp.renesas.com>
Singed-off-by: Duy Nguyen <duy.nguyen.xa@renesas.com>