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9625 supports SPI ethernet on BLSP1 QUP6. Add the dts data,
gpiomux configurations and the board setup code for it.

Change-Id: Ib185a9a0a6bf830fcb53b05a2c60e34a740e8e52
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>