mmc: sdhci: correct the maximum timeout when enable CMDQ

Change to use sdhci_set_timeout() to set the maximum timeout, so that
the host can use it's own set_timeout() callback to set the maximum
timeout if the host has.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>