net: phy: vitesse: add inband caps and configuration

net: phy: vitesse: add inband caps and configuration

Add support for VSC8662 reporting its inband capabilities, and also
hook to configure the PHY's inband mode.

This fixes a regression in the macb driver caused by commit
1338cfef1ff1 ("net: macb: fix SGMII with inband aneg disabled")

Cc: stable+noautosel@kernel.org # neither this nor commit under fixes should be backported
Reported-by: Conor Dooley <conor@kernel.org>
Link: https://lore.kernel.org/r/20260304-nebulizer-rounding-40fbc81a2ba1@spud
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Fixes: 1338cfef1ff1b958 ("net: macb: fix SGMII with inband aneg disabled")
Link: https://patch.msgid.link/E1w082O-0000000ChNc-1wDz@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>