rpmb: move rpmb_frame struct and constants to common header

Move struct rpmb_frame and RPMB operation constants from MMC block
driver to include/linux/rpmb.h for reuse across different RPMB
implementations (UFS, NVMe, etc.).

Signed-off-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@sandisk.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>