arm64: dts: rockchip: cm3j-rpi-cm4: use emc2305,*

[LZhaoM]

arm64: dts: rockchip: cm3j-rpi-cm4: use emc2305,*

The microchip,emc2301 driver accepts the following properties[0]:
emc2305,cooling-levels
emc2305,pwm-max
emc2305,pwm-min
emc2305,pwm-channel

Because `of_property_read_u8`[0] is used, the 8 bits type needs to be
explicitly stated.

[0]: https://github.com/radxa/kernel/blob/e7976b5c9bd2f34e21d3cc871f54d67470e1ec42/drivers/hwmon/emc2305.c#L311-L333

Signed-off-by: Zhaoming Luo <luozhaoming@radxa.com>

[RadxaYuntian]

我看上游binding是用子节点来配置的呀：https://www.kernel.org/doc/Documentation/devicetree/bindings/hwmon/microchip%2Cemc2305.yaml

[LZhaoM]

因为上游的驱动很新，设备树的配置方法跟我们使用的驱动不太一样。我们的跟6.1.y0的emc2305驱动更相近，然后6.1.y里也没有emc2305 devicetree binding的配置资料，所以我是看着源码写的设备树。emc2305,pwm-channel设置成0就是所有channel都使用相同的thermal zone了1。