tf-a-static-checks: pass params to child job

``tf-a-ci-gateway`` defaults to origin/master for TF-A if
TF_GERRIT_REFSPEC isn't provided as a build parameter. This is
particularly problematic in the daily job where we run tests against
the integration branch. Ensure the test runner has all the required
build parameters.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: I11f36819af3e0ddd09b93c6d056940179b6b891b
1 file changed