dt-bindings: mfd: Explain lack of child dependency in simple-mfd

Common mistake of usage of 'simple-mfd' compatible is a dependency of
children on resources acquired and managed by the parent, e.g. clocks.
Extend the simple-mfd documentation to cover this case.

Cc: Linus Walleij <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Rob Herring (Arm) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

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