Log Message:
Update nvramtool to git HEAD as of today using local distfile.

No upstream change summary, but the old version no longer worked with
modern coreboot.

Distfile created from a full clone of the coreboot tree with below script;
#!/bin/sh
cbver=`git describe`
cbobj=`git ls-tree origin/master util/nvramtool|awk '{print $3}'|cut -c 1-7`
distname=nvramtool-"$cbver"-"$cbobj"
git archive -o /tmp/"$distname".tar.gz --prefix="$distname"/ \ 
"$cbobj"