fvp: move to newer FVP 11.26 model

Remove all reference to all older model and move all testing to newer
11.26 FVP model.

Change-Id: I98cb38499a0a00d1889f860a7e24712f6783b4d7
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
(cherry picked from commit 8962c450b80032884ba09757d9a7722506afc07d)
5 files changed