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zilinx/zy7_qspi: Add a qspi driver for Zynq platforms.

Description

zilinx/zy7_qspi: Add a qspi driver for Zynq platforms.

This is a qspi driver for the Xilinx Zynq-7000 chip.
It could be useful for anyone wanting to boot a system from flash memory
instead of SD cards.

Submitted by: Thomas Skibo (thomasskibo@yahoo.com)
Differential Revision: https://reviews.freebsd.org/D14698