test(fwu): validate scenario of invalid FWU IMAGE SIZE

Test to increase code coverage in bl1 directory where
bl2 and bl2u are both corrupt with invalid image sizes

bl1_fwu.c cc% improved by 10%
bl1_main.c cc% imporved by 1%

Change-Id: I4637a9e566e4edda8474da37ea4f3511fa32b6a7
Signed-off-by: Thaddeus Gonzalez-Serna <Thaddeus.Gonzalez-Serna@arm.com>
4 files changed