soc: xilinx: versal: Add soc_xilinx_versal driver

soc: xilinx: versal: Add soc_xilinx_versal driver

soc_xilinx_versal driver allows identification of family & revision
of versal SoC. This driver is selected by CONFIG_SOC_XILINX_VERSAL.
Probe this driver using platdata U_BOOT_DEVICE structure which is
defined at mach-versal/cpu.c.
Add this config to xilinx_versal_virt_defconfig &
xilinx_versal_mini_ospi_defconfig file to select this driver.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Reviewed-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>