feat(neg-boot): tftf invalid rotpk test

Test to improve code coverage in scenario with corrupt rotpk in fip certificate

Change-Id: I995ab6d9f1488fda44e10ae9ef70c9056d780a89
Signed-off-by: Thaddeus Gonzalez-Serna <Thaddeus.Gonzalez-Serna@arm.com>
5 files changed