mmc: core: Move eMMC cache flushing to a new bus_ops callback

To prepare to add internal cache management for SD cards, let's start by
moving the eMMC specific code into a new ->flush_cache() bus_ops callback.

In this way, it becomes straight forward to add the SD specific parts,
as subsequent changes are about to show.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210506145829.198823-2-ulf.hansson@linaro.org

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