tests: os: skip persistent logging test for pi0

[rcooke-warwick]

there is currently an issue with persistent logging on the rpi0 balena-os/balena-raspberrypi#927

in order to accelerate releases for this device type @alexgg suggested we could skip this test for the pi0, as its currently blocking

Change-type: patch
Signed-off-by: Ryan Cooke [email protected]

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[alexgg]

lgtm