mmc: zynq_sdhci: Add common function to set input/output tapdelays

Remove setting tapdelays for different speeds separately. Instead use
the ITAP and OTAP delay values which are read from the device tree.
If the DT does not contain tap delay values, the predefined values
will be used for the same.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>