rdv3cfg2: disable lca for all the chips

On newer FVP models, LCA is enabled by default. The feature is not
supported in the firmware. Disable LCA until it is supported by the
firmware.

Signed-off-by: Nishant Sharma <nishant.sharma@arm.com>
Change-Id: Ie92aa231fe077b599681991329c4a4eef2cc024d