kci_test: remove "arm" as default architecture in test results
kci_test: remove "arm" as default architecture in test results

There is no apparent reason why one architecture should be set by
default when parsing test results callback meta-data.  If there is no
architecture then the data is simply not valid.

Remove the default value, which will result in an HTTP error if there
is no arch set in the callback meta-data.

Signed-off-by: Guillaume Tucker <e7e20b7c30f19d4ca6b81319ef81bf200369d137@collabora.com>

kernelci/kernelci-backend,kernelci/kernelci-backend