[coreboot] [coreboot - Cleanup #306] (New) Get rid of CBFS master header

Issue #306 has been reported by Patrick Georgi.

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Cleanup #306: Get rid of CBFS master header
https://ticket.coreboot.org/issues/306

* Author: Patrick Georgi
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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The CBFS master header has been used for some basic partitioning of the flash before we established the use of FMAP. Now that FMAP is the default mechanism across the tree, we should get rid of the master header.

This is a tracking issue to collect what needs to be done before we can retire the master header for good.