mmc: host: set ddr mode divisor value

mmc: host: set ddr mode divisor value

Tegra sdmmc controllers support ddr mode
only with divisor value of 1. Using fixed
divisor of 1 in ddr mode.

Change-Id: I32e296dd559d5638ccce2316819708273d62718c
Signed-off-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Signed-off-by: R Raj Kumar <rrajk@nvidia.com>
Reviewed-on: http://git-master/r/1126617
Reviewed-by: Venkata Jagadish <vjagadish@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>