Merge branch 'stmmac-SPDX'

Neil Armstrong says:

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net: stmmac: dwmac-meson: update with SPDX Licence identifier

Update the SPDX Licence identifier for the Amlogic Meson6 and Meson8 dwmac
glue drivers.
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Signed-off-by: David S. Miller <davem@davemloft.net>