feat(fwu): validate BL2 boots with empty FIP_A/FIP_B

The test case leave FIP_A and FIP_B empty, while
keeping a valid BL2. The system should still able
to load BL2. This test is to ensure the separation
of BL2

Signed-off-by: Xialin Liu <xialin.liu@arm.com>
Change-Id: I4f16dc2d32975ac168e8e0309f256176a5e28278
2 files changed