mosys: Fix YAML whitelabel logic

The logic was wrong for whitelabels and caused identities to match the
first config with correct sku instead of the correct config with both a
sku and whitelabel-tag match.

BUG=b:78274444
TEST=build and test on whitetip/santa and unit tests

Change-Id: Ib8df2f2394be7659d4440c7197fd359e7dde18d4
Reviewed-on: https://chromium-review.googlesource.com/1313534
Commit-Ready: C Shapiro <shapiroc@chromium.org>
Tested-by: C Shapiro <shapiroc@chromium.org>
Reviewed-by: Gregory Meinke <gmeinke@chromium.org>
1 file changed