net: mvpp2: use port_count to remove ports

As discussed in [1], there is no need to iterate over child nodes to
remove the list of ports. Instead, a loop up to `port_count` ports can
be used, and is in fact more reliable in case the child node
availability changes.

The suggested approach removes the need for the `fwnode` and
`port_fwnode` variables in mvpp2_remove() as well.

Link: https://lore.kernel.org/all/[email protected]/ [1]
Suggested-by: Russell King <[email protected]>
Signed-off-by: Javier Carrasco <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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