mmc: Reliable write support.
Allows reliable writes to be used for MMC writes. Reliable writes are used to service write REQ_FUA/REQ_META requests. Handles both the legacy and the enhanced reliable write support in MMC cards. Signed-off-by: NAndrei Warkentin <andreiw@motorola.com> Reviewed-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NChris Ball <cjb@laptop.org>
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