arm64: Add Xilinx ZynqMP support

Add basic Xilinx ZynqMP arm64 support.
Serial and SD is supported.
It supports emulation platfrom ep108 and QEMU.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/xilinx/zynqmp/Kconfig b/board/xilinx/zynqmp/Kconfig
new file mode 100644
index 0000000..b07932e
--- /dev/null
+++ b/board/xilinx/zynqmp/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_XILINX_ZYNQMP
+
+config SYS_BOARD
+	default "zynqmp"
+
+config SYS_VENDOR
+	default "xilinx"
+
+config SYS_SOC
+	default "zynqmp"
+
+config SYS_CONFIG_NAME
+	default "xilinx_zynqmp"
+
+endif