group/tf-l3-boot-tests-css: Remove rde1edge platform

Due to the upcoming updates in SCP & TF-A, RD-E1-EDGE
needs further investigation to fully support up-to-date
features.

Temporarily remove the platform boot tests from the
tf-l3-boot-tests-css until full support is implemented.

Change-Id: Ib88861094a495ddaf1f5539aeb98b7b9a34d65ad
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
2 files changed