ci(trng): add TRNG build for Juno platform

This patch adds TRNG build configs for the following CI groups:
1. TF-A (tf-l1-build-juno)
2. TFTF (tftf-l1-build)

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I1cec7411ed5406d7fdad2612293384103b19b998
4 files changed