Change in coreboot[master]: soc/marvell/bg4cd: Get rid of spi.c

[Furquan Shaikh (Code Review)]

Furquan Shaikh has abandoned this change. ( https://review.coreboot.org/19775 )

Change subject: soc/marvell/bg4cd: Get rid of spi.c
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Abandoned

SoC deleted instead.