image.bbclass: re-run do_rootfs when feature packages change
Currently, FEATURE_PACKAGE_<feature> isn't in any vardeps, so changing the
packages for a feature won't change the checksum for do_rootfs. Rather than
explicitly adding those to vardeps, just use the expanded form of
FEATURE_INSTALL and FEATURE_INSTALL_OPTIONAL, so the actual list of packages
from the features goes into the checksum.
(From OE-Core rev:
fdd1669e04bd8219344b1896b9d9c6a187e4f84e)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
