zynq: Add zynq microzed board support

zynq: Add zynq microzed board support

MicroZed is a low-cost development board based on
the Xilinx Zynq-7000 All Programmable SoC.

APSOC:
- XC7Z010-1CLG400C
Memory:
- 1 GB of DDR3 SDRAM
- 128Mb of QSPI flash(S25FL128SAGBHI200)
- Micro SD card interface
Communication:
- 10/100/1000 Ethernet
- USB 2.0
- USB-UART
User I/O:
- 100 User I/O (50 per connector)
- Configurable as up to 48 LVDS pairs or 100 single-ended I/O
Misc:
- Xilinx PC4 JTAG configuration port
- PS JTAG pins accessible via Pmod
- 33.33 MHz oscillator
- User LED and push switch

For more info - http://zedboard.org/product/microzed

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>