Felix Fietkau 4e6bf60956 net: ethernet: mtk_eth_soc: cache HW pointer of last freed TX descriptor
The value is only updated by the CPU, so it is cheaper to access from the
ring data structure than from a hardware register.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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..
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