xlnx-zcu102: Add support for the ZynqMP QSPI

xlnx-zcu102: Add support for the ZynqMP QSPI

Add support for the ZynqMP QSPI (consisting of the Generic QSPI and Legacy
QSPI) and connect Numonyx n25q512a11 flashes to it.

Signed-off-by: Francisco Iglesias <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Reviewed-by: Edgar E. Iglesias <[email protected]>
Tested-by: Edgar E. Iglesias <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Message-id: 20171126231634[email protected]
Signed-off-by: Peter Maydell <[email protected]>