Now as boot-deploy allows us to generate both boot.img and extlinux.conf
at the same time, enable generating the config for all msm8916 since it
will be used in the future lk2nd release. boot.img is still kept to keep
compatibility with current lk2nd releases and to allow system recovery
with fastboot when required.
[ci:skip-build] already built successfully in CI
[ci:ignore-count]
