drivers: mmc: host: sdhci_am654: fix start loop index

commit 527095165281cbc60a1b42995c1e55e6756cbe93 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



ti,otap-del-sel-legacy/ti,itap-del-sel-legacy passed
from DT are currently ignored for all SD/MMC and eMMC
modes.
Fix this by making start loop index to MMC_TIMING_LEGACY.

Fixes: 8ee5fc0e ("mmc: sdhci_am654: Update OTAPDLY writes")
Signed-off-by: Nitin Yadav <n-yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>