mmc: zynq_sdhci: Add support for SD3.0

This patch adds support of SD3.0 for ZynqMP.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>