build_package: checkout SCMI library from settings

The tools-non-public contains a reference to the correct
commit for the SCMI library to be used for testing.
This patch makes sure that the above reference is also used
in this test instance.

Change-Id: If6cb79843d06d0393e2edb7edadfda90491ef797
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
1 file changed