mmc: zynq_sdhci: Add support for eMMC5.1 for Versal NET platform

Add support for eMMC 5.1 for Versal NET platform
 - Add new compatible string(xlnx,versal-net-5.1-emmc).
 - Add CONFIG_ARCH_VERSAL_NET condition wherever required.
 - Add DLL and Delay Chain mode support
 - Add input and output tap delays for eMMC.
 - Add Strobe select tap for HS400 mode.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>