petitboot: Add --verbose option to petitboot when we're configured for debug

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
package/busybox: Add pxepathprefix patch for udhcpc

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
package/petitboot: Update version to 896dbe8

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
firmware/skiboot: always specify GIT_SHA

When we're building skiboot in buildroot, we'll be using a non-git
tarball. skiboot's makefiles expect to grab the git version by calling
`git`, but that's not going to work with a tarball.

This change explicitly sets GIT_SHA for skiboot builds.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
skiboot: Update version to c34c4ef8

We need to update to a known-good skiboot version, but this requires a
(temporary) workaround for the OCC timeout.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Merge branch 'master' of github.com:brs332/buildroot