Add defconfig and devicetree for zynq-miami SOM

Add configuration files for the zynq-miami module, and its carrier
board called "Florida". The module carries a Zynq 7030 or 7015 with
memory, clocks, usb/eth phys and regulators. The florida board adds
an adv7511 HDMI controller, ads1298 ADC chips, connectors and a
bunch of other periferals.