net: ravb: Add dependency on CONFIG_BITBANGMII

The Renesas RAVB driver always requires bitbang MDIO bus support.

Fixes: 8ae51b6f324e ("net: ravb: Add Renesas Ethernet RAVB driver")
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
1 file changed