Merge branch 'stmmac-filtering-fixes'

Jose Abreu says:

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net: stmmac: Filtering fixes

Two single fixes for the L3 and L4 filtering in stmmac.

1) Updates the internal status of RSS when disabling it in order to keep
internal driver status consistent.

2) Do not lets user add a filter if RSS is enabled because the filter will
not work correctly as RSS bypasses this mechanism.
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Signed-off-by: David S. Miller <davem@davemloft.net>