net: sh_eth: arm: renesas: README: Drop CFG_SH_ETHER_CACHE_*
Drop CFG_SH_ETHER_CACHE_WRITEBACK and CFG_SH_ETHER_CACHE_INVALIDATE, which are now always enabled in the sh_eth driver, because those cache operations are always available. On architectures which do not implement cache operations yet, cache operations have to be implemented first. CFG_SH_ETHER_ALIGNE_SIZE now set as SH_ETHER_ALIGN_SIZE in sh_eth.h based on architecture and no longer configured on board level. Remove CFG_SH_ETHER_CACHE_WRITEBACK configuration option from README. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
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