remove/Fix cpu test for nonexistent lcg-toolchains platform

This MR is an intermediate solution before we properly fix #413 (closed).

assigned to @roneil

added RTA label

@dcampora WDYT?

changed title from Fix cpu test for nonexistent lcg-toolchains platform to remove/Fix cpu test for nonexistent lcg-toolchains platform

mentioned in issue Moore#563 (closed)

changed the description

added only GitLab CI label

resolved all threads

approved this merge request

merged

mentioned in commit 57947d0c

mentioned in merge request !865 (merged)

mentioned in issue Moore#574 (closed)