Change in coreboot[master]: soc/marvell/bg4cd: remove cosmos mainboard and bg4cd soc

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Change subject: soc/marvell/bg4cd: remove cosmos mainboard and bg4cd soc
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/9901/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/54166/ : SUCCESS