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The CPU uplink port on the KSZ9477 is P5 not P6 - fix this.

Fixes: 7899eb6c

 ("arm64: dts: imx: Add i.MX8M Plus Gateworks gw7400 dts support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>