mmc: sh_mobile_sdhi: properly document R-Car versions
Replace hardcoded values with meaningful names and document what we know. Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: NSimon Horman <horms+renesas@verge.net.au> Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
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