arm64: dts: rockchip: Remove #cooling-cells from fan on Theobroma lion

All Theobroma boards use a ti,amc6821 as fan controller.
It normally runs in an automatically controlled way and while it may be
possible to use it as part of a dt-based thermal management, this is
not yet specified in the binding, nor implemented in any kernel.

Newer boards already don't contain that #cooling-cells property, but
older ones do. So remove them for now, they can be re-added if thermal
integration gets implemented in the future.

There are two further occurences in v6.12-rc in px30-ringneck and
rk3399-puma, but those already get removed by the i2c-mux conversion
scheduled for 6.13 . As the undocumented property is in the kernel so
long, I opted for not causing extra merge conflicts between 6.12 and 6.13

Fixes: d99a02b ("arm64: dts: rockchip: add RK3368-uQ7 (Lion) SoM")
Cc: Quentin Schulz <[email protected]>
Cc: Klaus Goger <[email protected]>
Reviewed-by: Quentin Schulz <[email protected]>
Reviewed-by: Dragan Simic <[email protected]>
Signed-off-by: Heiko Stuebner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: mmind

arch/arm64/boot/dts/rockchip/rk3368-lion.dtsi

@@ -61,7 +61,6 @@
 			fan: fan@18 {
 				compatible = "ti,amc6821";
 				reg = <0x18>;
-				#cooling-cells = <2>;
 			};
 
 			rtc_twi: rtc@6f {