net: mvneta: dcache flush TX descriptors at init
This fixes sporadic timeout on initial packet Tx (usually ARP), with an error message like: timeout: packet not sent Reviewed-by: NStefan Roese <sr@denx.de> Tested-by: NChris Packham <judge.packham@gmail.com> Acked-by: NJoe Hershberger <joe.hershberger@ni.com> Signed-off-by: NRabeeh Khoury <rabeeh@solid-run.com> Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
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