feat(rdfremont): initialize the rse comms driver

Define platform specific API to fetch base address for secure or root
MHUv3 between AP-RSE invoke rse-comms driver initialization bl31
platform setup stage.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Signed-off-by: Vivek Gautam <vivek.gautam@arm.com>
Change-Id: Id79bcdb2fda6cdf394f4e02f67d1c1a44d5ddf23
3 files changed