This cuts downloads in half as only the needed sources are downloaded.
It also makes the packages simpler and fixes a bug where the oneplus3t
subpackage was overwriting the 20-adreno-gpu-firmware.files of the
oneplus3 subpackage.
Add pmb:cross-native/!tracedeps to applicable firmware packages and
secure both with a test.
This sets the pmb:cross-native and !tracedeps options on all firmware-*
packages that are compatible with the native compilation method. A unit
test ensures the presence of both options while maintaining a list of
exempted packages.
Fixes: #718
[ci:ignore-count] [ci:skip-vercheck] [ci:skip-build]
