mmc: Add generic tuning flag

Set generic mmc->tuning flag when performing tuning to indicate
this condition to drivers. Drivers may use this to bypass various
checks during tuning.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
2 files changed