builders.sh: set and export spm_config

The SPM config is a recent build integrated into the CI scripts, so
Open CI should take it into account.

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: Ibf17c3ff892668e40c5d4e5433985b22b45d7ba3
diff --git a/tf-a-builder/builders.sh b/tf-a-builder/builders.sh
index 0bb1237..cf2776a 100755
--- a/tf-a-builder/builders.sh
+++ b/tf-a-builder/builders.sh
@@ -161,6 +161,7 @@
 export tftf_config="$(echo "${build_config}" | awk -F, '{print $2}')"
 export scp_config="$(echo "${build_config}" | awk -F, '{print $3}')"
 export scp_tools="$(echo "${build_config}" | awk -F, '{print $4}')"
+export spm_config="$(echo "${build_config}" | awk -F, '{print $5}')"
 
 export run_config="${rhs%.test}"