mvneta: Fix MTU update sequence
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Authored by kd on Aug 30 2021, 9:11 AM.

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mw
wma

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rGdcd0d08b692f: mvneta: Fix MTU update sequence
rG5438ef47e377: mvneta: Fix MTU update sequence

Summary

After MTU is updated we might start using allocating RX buffers from different pool. (MJUM9BYTES vs MCLBYTES)
Because of that we need to update the RX buffer size in hardware.
Previously it was done only when the interface was up, which is incorrect since MTU can be changed at any time.