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On some systems which use MMC as a main storage device
it is possible that RPMB commands are mixed with
generic MMC access commands which invalidates RPMB.

This patch uses MMC_IOC_MULTI_CMD.
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Chris Ball <chris@printf.net>