Update version string and fix some internal variables in Makefile

Moving from Subversion to Git necessitated re-formatting the version
string. In this case, we're making it look more like the Chromium OS
branch of Flashrom, which uses colons in between fields.

However, some of the internal variables that get passed into
other kconfig scripts don't handle the new formatting well. In those
cases, we'll use the x.y.z format without the SCM-generated info.

Note: The git info will only appear for versions which ahve been

TEST=built and run on stumpy

Change-Id: Ie2f88225bcb2c1b8409bf6755b270f44142e251f
1 file changed