documentation: Update the document about building coreboot

The previous LinuxBIOS-AMD64.tex was still working with subversion.

We need a document to give the preliminary steps to build coreboot
for a new guys.

Change-Id: I64240c8344456e724f0823680e0534cf1db4c4a8
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/4510
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

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