arm64: dts: rockchip: move I2C6 from Haikou carrierboard to Puma DTSI

arm64: dts: rockchip: move I2C6 from Haikou carrierboard to Puma DTSI

I2C6 is not exposed on Q7 golden fingers which is for routing signals to
the carrierboard but on Q7 Camera connector, for routing signals to an
additional adapter (e.g. Q7 Camera Demo adapter).

Therefore, let's move the modification of I2C6 bus to Puma DTSI.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Link: https://lore.kernel.org/r/20250218-tsd-align-haikou-v1-3-5c44d1dd8658@cherry.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>