mmc: sdhci: Add a quirk to ignore CMD CRC err for tuning commands

MSM SDHCI controller doesn't support tuning as specified by the
Standard Host Controller 3.0 spec. As a result of which,
CMD CRC errors are expected for tuning commands. Hence, add a
new quirk SDHCI_QUIRK2_IGNORE_CMDCRC_FOR_TUNING to ignore
those errors for tuning commands.

Change-Id: Id43d300bf8fabea921c80931fbf45cd3782ff3fa
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>