juno: Add security sources for tsp-juno
juno: Add security sources for tsp-juno

Security sources are required if stack-protector is enabled.

Change-Id: Ia0071f60cf03d48b200fd1facbe50bd9e2f8f282
Signed-off-by: Louis Mayencourt <053c3ea6b10c921896b13cd162dd1cf31fffc07a@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware