ci: remove legacy SCP CI support

The code removed by this change represents the remaining dead remnants
of the previous SCP CI, which used to piggy-back on the TF-A to run its
testing regime. This scenario is no longer supported, so remove it.

Change-Id: If0ed5096f7e208c0865f9aac9c15ab4beddc8c6b
Signed-off-by: Chris Kay <chris.kay@arm.com>
(cherry picked from commit 4f7846ab7510e37f88ecb2659de2fdf89d502911)
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
22 files changed