net: phy: aquantia: rename AQR412 to AQR412C and add real AQR412

net: phy: aquantia: rename AQR412 to AQR412C and add real AQR412

I have noticed from schematics and firmware images that the PHY for
which I've previously added support in commit 973fbe68df39 ("net: phy:
aquantia: add AQR112 and AQR412 PHY IDs") is actually an AQR412C, not
AQR412.

These are actually PHYs from the same generation, and Marvell documents
them as differing only in the size of the FCCSP package: 19x19 mm for
the AQR412, vs 14x12mm for the Compact AQR412C.

I don't think there is any point in backporting this to stable kernels,
since the PHYs are identical in capabilities, and no functional
difference is expected regardless of how the PHY is identified.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250821152022.1065237-2-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>