ARM: dts: Fix up wrv54g device tree

ARM: dts: Fix up wrv54g device tree

Fix up the KS8995 switch and PHYs the way that is most likely:

- Phy 1-4 is certainly the PHYs of the KS8995 (mask 0x1e in
  the outoftree code masks PHYs 1,2,3,4).
- Phy 5 is the MII-P5 separate WAN phy of the KS8995 directly
  connected to EthC.
- The EthB MII is probably connected as CPU interface to the
  KS8995.

Properly integrate the KS8995 switch using the new bindings.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250625-ks8995-dsa-bindings-v2-2-ce71dce9be0b@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>