imagelib: fwid: Stop including the ChromeOS version in the Fwid automatically.

Instead, just use the literal value passed in from the config, and fix up that
value back in the Makefile. Plumb *that* value in from either the ChromeOS
build system if building in that environment, or from whatever is appropriate
in the environment being used. It could even be left out entirely if necessary.

Change-Id: I3b177fa3a91a1a547166cd2bbb12ea35b0d107dd
1 file changed