mmc: sdhci: Add new quirk to use PIO for eMMC tuning commands

Some controllers have an issue using ADMA for tuning commands.
Add a quirk - SDHCI_QUIRK2_USE_PIO_FOR_EMMC_TUNING to use PIO
mode for tuning commands on those host controllers.

Change-Id: Id9625167d7e235fb3a20a6193889c1654b5c0cd8
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
[subhashj@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>