defconfig: 9625: Enable SPI, SPI Ethernet and dependent NET configs

This patch enables SPI and SPI ethernet for MSM9625. Since ethernet
requires the NET configs to be enabled to function correct, enable
these configs as well.

Change-Id: I747f565805db8b889cdb8996b88d3b33dce33d82
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>