pl110: Rename pl110_version enum values

pl110: Rename pl110_version enum values

The PL110 enum value name will conflict with the PL110 type cast
checker, when we replace the existing macro with an inline
function.  Add a VERSION_ prefix to all pl110_version enum
values, to avoid conflicts.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Tested-By: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20200825192110.3528606-5-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>