mmc: sdhci: Fix bug in trigger for HS200 tuning

Need for HS200 tuning should not be tied to SDR50, this patch
fixes that.

Change-Id: I80559f4288c8e8fe8027a0f425abb21b87fdb400
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>