roomservice: check all device repositories

Some devices have the same codename but shipped a long time
ago and may not have a current branch set up.
Continue looking up all repositories until a match is found
or no repos are left to check.

For example:

  - android_device_amazon_thor
    - cm-14.1
  - android_device_xiaomi_thor
    - lineage-21.0

  - android_device_semc_zeus
    - jellybean
  - android_device_xiaomi_zeus
    - lineage-21.0

  - android_device_amazon_otter
    - cm-12.1
  - android_device_shift_otter
    - lineage-21.0

Change-Id: Icf9826b31efd872363fdfe73d5a71ff2d06cbe20
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>