fvp: move a710 to 8 core test

With 11.26.11 FVP models a710 is a 8 core FVP, so move tests
to use 8 cores rather than 4 cores.

If we setup as 4 cores from FVP kernel still recognises as 8 core system.
[...]
 rcu: 	RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=8.
[...]

This means kernel can schedule init.sh on any of the core ids.
But since we fail to bring up core4 to 7 and we schedule on any of
these cores will eventually lead to a hang with init.sh
not mounting the rootfs, if init.sh is run on core4 to 7.

Also in ci scripts we wait for shell prompt "#" for test to pass
which may not happen when init.sh fails.

Change-Id: Iadd87cbbe8bbb2d456496b9ce65e785f686b66af
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/model/cortex-a710.sh b/model/cortex-a710.sh
index 05cc49d..3e11d1e 100644
--- a/model/cortex-a710.sh
+++ b/model/cortex-a710.sh
@@ -15,7 +15,7 @@
 -C bp.terminal_2.start_port=5002
 -C bp.terminal_3.start_port=5003
 
--C cluster0.NUM_CORES=4
+-C cluster0.NUM_CORES=8
 
 -C pctl.use_in_cluster_ppu=true
 -C cluster0.core_power_on_by_default=false