[platform][zynq] add quick 'n dirty support for Xilinx Zynq FPGA SoC

-tested against qemu model only at this point
-uart is polled

target/zynq-qemu/rules.mk

@@ -0,0 +1,15 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+#MODULE := $(LOCAL_DIR)
+
+GLOBAL_INCLUDES += \
+	$(LOCAL_DIR)/include
+
+PLATFORM := zynq
+
+MODULES += \
+
+GLOBAL_DEFINES += \
+
+#include make/module.mk
+