Add MCUBoot repo as a dependency to TF-M CI

In order to make upstream MCUBoot repo to be the
default bootloader in TF-M the CI need to download
the repo to be able to access to it during build.

Change-Id: I454148a56d700f592642aae06026cca320b3eb0a
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
1 file changed