incusd/apparmor/instance: Allow all firmwares #75

Job	Run time
Code tests	7m 39s
Client tests (1.20.x, ubuntu-latest)	28s
Client tests (1.20.x, macos-latest)	45s
Client tests (1.20.x, windows-latest)	3m 58s
Documentation tests	8m 1s
System tests (1.20.x, cluster, dir)	12m 21s
System tests (1.20.x, cluster, btrfs)	14m 6s
System tests (1.20.x, cluster, lvm)	13m 19s
System tests (1.20.x, cluster, zfs)	13m 33s
System tests (1.20.x, cluster, ceph)	6m 28s
System tests (1.20.x, cluster, random)	11m 40s
System tests (1.20.x, standalone, dir)	23m 36s
System tests (1.20.x, standalone, btrfs)	24m 42s
System tests (1.20.x, standalone, lvm)	37m 38s
System tests (1.20.x, standalone, zfs)	39m 5s
System tests (1.20.x, standalone, ceph)	1h 9m 26s
System tests (1.20.x, standalone, random)	22m 20s
System tests (stable, cluster, dir)	11m 34s
System tests (stable, standalone, dir)	23m 36s
System tests (tip, cluster, dir)	12m 52s
System tests (tip, standalone, dir)	22m 28s
	6h 19m 35s

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