net: phy: Turn default auto-negotiation timeout into Kconfig symbol

Let users configure default auto-negotiation timeout via Kconfig
instead of specifying it in board configuration headers. This is
the first step toward converting this to Kconfig fully, so far the
legacy PHY_ANEG_TIMEOUT in configuration headers takes precedence.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
2 files changed