documentation: Change the file name of document for building Coreboot

I am planning to write a document for new man, helping them to build a
working image from knowing nothing about Coreboot. The previous
LinuxBIOS-AMD64.tex was a good script.

LinuxBIOS was a out-of-date name. It needs to be changed it to Coreboot.
And the new document is not specific to AMD, so we get rid of the AMD64 from
the file name.

This is a separate patch for the renaming.

LinuxBIOS-AMD64.tex was still about SVN and buildtarget. Later patch
will come up for updating those old thing. And this new document,
CorebootBuildingGuide.tex, is planning to be only about building.
Navigating the source code is moved to later advanced document.

Change-Id: Ia8a2fd9db51e9870c1d645067bcfdc91ae1bf90a
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/4487
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

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