can: "bosch,m-can-base": Warning "missing or empty reg/ranges property"

[erwango]

Describe the bug
When building (any application) one of the boards that include can node with compatible "bosch,m-can-base",
the following warning is generated:

~/zephyrproject/zephyr/samples/synchronization/build/nucleo_h723zg/zephyr/zephyr.dts:2708.7-2734.5: Warning (simple_bus_reg): /soc/can: missing or empty reg/ranges property

To Reproduce
west build -b nucleo_h723zg samples/hello_world

Expected behavior
No warning generated

Impact
Annoyance

[henrikbrixandersen]

Agreed. We need to look into reworking the current hierarchy of Bosch M_CAN devicetree bindings (e.g. for STM32, we have compatible = "bosch,m-can-base" nodes with compatible = "st,stm32-fdcan" children, which is kind of weird).

[github-actions]

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[henrikbrixandersen]

@erwango First step in solving this: #45014

[henrikbrixandersen]

@erwango Second step in solving this: #44951

More to follow.