tifm_sd: replace command completion state machine with full checking
State machine used to to track mmc command state was found to be fragile and unreliable, making many cards unusable. The safer solution is to perform all needed checks at every card event. Signed-off-by: NAlex Dubov <oakad@yahoo.com> Signed-off-by: NPierre Ossman <drzeus@drzeus.cx>
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