ARM: dts: turris-omnia: Add MCU system-controller node

Turris Omnia's MCU provides various features that can be configured over
I2C at address 0x2a. Add device-tree node.

This does not carry a Fixes tag - we do not want this to get backported
to stable kernels for the following reason: U-Boot since v2022.10
inserts a phy-reset-gpio property into the WAN ethernet node pointing to
the MCU node if it finds the MCU node with a cznic,turris-omnia-mcu
compatible. Thus if this change got backported to a stable kernel, the
WAN interface driver would defer probe indefinitely (since it would wait
for the turris-omnia-mcu driver which would not be present).

Signed-off-by: Marek Behún <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Acked-by: Bartosz Golaszewski <[email protected]>
Acked-by: Alexandre Belloni <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

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