bundle.bbclass: add a few explicit vardeps to do_unpack
bundle.bbclass: add a few explicit vardeps to do_unpack

bitbake doesn't seem to pick up the dependence of do_unpack on
RAUC_BUNDLE_HOOKS automatically (e.g., changing RAUC_BUNDLE_HOOKS[hooks]
does not cause a rebuild), so add that explicitly. While at it, also
make sure that any change in RAUC_SLOT_foo causes a rebuild.

Signed-off-by: Rasmus Villemoes <4a950b3c050761f138a737fe02e762ea6e8a2378@prevas.dk>

rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc,rauc/meta-rauc