[FS#547] SATA Port Multiplier support for mvebu devices

[LEDE Bugs]

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FS#547 - SATA Port Multiplier support for mvebu devices
User who did this: Mathias Kresin (mkresin)
Task Type: Bug Report -> Feature Request

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=547