build_image_util: do not symlink etc/portage/profile
build_image_util: do not symlink etc/portage/profile

Create profile as a real directory instead of a symlink to the board
root's configuration. Normally the board root does not modify this but
it is useful for build_image to use it to modify package.provided.

vmware/coreos-scripts,sigma/coreos-scripts,trnubo/scripts,gtank/scripts,marineam/coreos-scripts,fivethreeo/scripts,sigma/coreos-scripts,BugRoger/scripts,endocode/scripts,vmware/coreos-scripts,mischief/scripts,andrejro/coreos--scripts,zhang0137/scripts,nicescale/scripts,smilart/scripts,marineam/coreos-scripts,fivethreeo/scripts,fivethreeo/scripts,nicescale/scripts,BugRoger/scripts,coreos/scripts,endocode/scripts,mjg59/scripts,smilart/scripts,sigma/coreos-scripts,zhang0137/scripts,marineam/coreos-scripts,nicescale/scripts,BugRoger/scripts,zhang0137/scripts,glevand/coreos--scripts,vmware/coreos-scripts,smilart/scripts,mjg59/scripts,trnubo/scripts,gtank/scripts,andrejro/coreos--scripts,andrejro/coreos--scripts,endocode/scripts,mjg59/scripts,glevand/coreos--scripts,mischief/scripts,mischief/scripts,trnubo/scripts,gtank/scripts,coreos/scripts