chore: move plugins to access from model dir

Remove access and setup of plugins from public downloads area.
Assume all plugins are present with model binaries.

Currently with RevC model we are using the following plugins
 - ETMv4ExamplePlugin.so
 - GenericTrace.so
 - libete-plugin.so

A new RevC model package FVP_Base_RevC-2xAEMvA_11.26_11_Linux64.tgz
has been uploaded this package contains both the plugins in plugins
directory.

Change-Id: I0eca2774056821ae1563db99435e8e1d5e1e0245
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
(cherry picked from commit 7d80d9370e9001097c30a6518c35831fe6ae3a5b)
4 files changed