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: I42b2b474be163c66e11a449de6eec7d748e00fbb
Signed-off-by: Scott Murray <scott.murray@konsulko.com>