Split firmware into separate package

[Dimitri John Ledkov]

Split firmware into separate package

* Currently gsp.bin is shipped by nvidia-kernel-common that pulls in userspace dependencies and is required to match a particular driver

* This prevents co-installing LRM of different nvidia upstream releases from different kernels, entangles them together for migration, and makes it difficult to vendor LRM/drivers alone in the kernel snaps without any userspace components.

* To address some or all of the above things we need to split gsp.bin firmware into version specific package names, whilst keeping the dependency on the new nvidia-firmware-#FLAVOUR#-#VERSION#. Then once all dkms & lrms gain direct dependency on the nvidia-firmware-#FLAVOUR#-#VERSION# we will be able to consider relaxing or dropping dkms/lrm dependency on nvidia-kernel-common

* Even if we don't relax/drop the nvidia-kernel-common dependency down the line these changes will enable easier packaging of kernel snaps, and may allow in the future an easier reuse of gsp.bin by the open source driver.