soc: xilinx: versal-net: Add soc_xilinx_versal_net driver

Add soc_xilinx_versal_net driver to identify the family & revision of
versal-net SoC. Add Kconfig option CONFIG_SOC_XILINX_VERSAL_NET to
enable/disable this driver. To enable this driver by default, add this
config to xilinx_versal_net_virt_defconfig file. This driver will be
probed using platdata U_BOOT_DEVICE structure which is specified in
mach-versal-net/cpu.c.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/613d6bcffd9070f62cf348079ed16c120f8fc56f.1668612993.git.michal.simek@amd.com
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 031fa76..8438565 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -8,3 +8,4 @@
 obj-$(CONFIG_SANDBOX) += soc_sandbox.o
 obj-$(CONFIG_SOC_XILINX_ZYNQMP) += soc_xilinx_zynqmp.o
 obj-$(CONFIG_SOC_XILINX_VERSAL) += soc_xilinx_versal.o
+obj-$(CONFIG_SOC_XILINX_VERSAL_NET) += soc_xilinx_versal_net.o