docs: update FVP model path and parameters

This patch updates FVP parameters for the new
dual-cluster model. It also updates the DTS
path when building TF-A.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: Iaefc0620a41e1206d8af5035752b7e75544e4b16
1 file changed