support/testing/test/toolchain/test_external_bootlin: new test cases

This commit adds the new test cases generated automatically by the
bl-toolchains-gen script, to test the integration of the Bootlin
toolchains.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>