util/packer: Use new HWE kernel meta-package
util/packer: Use new HWE kernel meta-package

https://wiki.ubuntu.com/Kernel/LTSEnablementStack

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>
flynn/flynn,lmars/flynn,lmars/flynn,flynn/flynn,philiplb/flynn,flynn/flynn,lmars/flynn,philiplb/flynn,philiplb/flynn,flynn/flynn,philiplb/flynn,lmars/flynn,lmars/flynn,flynn/flynn,philiplb/flynn