Update recipes for transition to UNPACKDIR

Update recipes for transition to UNPACKDIR

Update recipes to handle the transition to using UNPACKDIR as the
destination for unpacked files.  For recipes that had been using
S = WORKDIR, the approach used in meta-openembedded has been
followed, i.e. using UNPACKDIR in tasks for consistency.

Bug-AGL: SPEC-5147

Change-Id: I32e277e15e5aa1ac93dadc67199dedd148d3d0b9
Signed-off-by: Scott Murray <scott.murray@konsulko.com>