sdhci: zynq: Remove hardcoded value zero as min frequency

Remove hardcoded value zero as min frequency and
use config option CONFIG_ZYNQ_SDHCI_MIN_FREQ
defined in board config

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
1 file changed