mmc: core: Do regular power cycle when lacking eMMC HW reset support
The eMMC HW reset may be implemented either via the host ops ->hw_reset() callback or through DT and the eMMC pwrseq. Additionally some eMMC cards don't support HW reset. To allow a reset to be done for the different combinations of mmc hosts and eMMC/MMC cards, let's implement a fallback via trying a regular power cycle. This improves the mmc block layer retry mechanism of failing I/O requests. Signed-off-by: NGwendal Grignou <gwendal@chromium.org> [Ulf: Rewrote changelog] Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
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