misc: Adjust timeout for compiler tests

This updates the timeout for the compiler tests to run per step
as opposed to by job, as well as increases this limit from
4 hours to 6 hours.

Change-Id: I6b0fe5561f74e450cd79205a96084dd27ccccead
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71458
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed