tf-m-build-and-test: Add MCUBOOT_URL and MCUBOOT_REFSPEC params

Similar to previous commit. Params and their default values are copied
from the corresponding "next" repo's job. Without these params, manually
started build fails.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I1e8821f460fe76110a83885eb3513fcdff286cd1
1 file changed