mmc: tmio: refactor tuning execution into SDHI driver

Move Renesas specific code for executing the tuning with a SCC into the
SDHI driver and leave only a generic call in the TMIO driver. Simplify
the code a little by removing init_tuning() and prepare_tuning()
callbacks. The latter is directly folded into the new execute_tuning()
callbacks.

Signed-off-by: Wolfram Sang <[email protected]>
Reviewed-by: Niklas Söderlund <[email protected]>
Reviewed-by: Yoshihiro Shimoda <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

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