rdv1/run_model: Add parameters to improve FVP's timing precisition

For supporting ACS SBSA compiance, and to support hotplug functionality,
it is required to improve the timing precisition of FVP. Add parameters
for the same.

Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>
Change-Id: Id363dd3cf04bb94ec004bb40ef870a9952e54a86