docs: update Cortex-A32 FVP model version

Change [1] migrated Cortex-A32 FVP model to the default version used in
the TF-A CI.

[1] https://review.trustedfirmware.org/c/ci/tf-a-ci-scripts/+/29297

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I038087af957d3ee2b289944b4af1a8cffb1ec5ff
1 file changed