product/rdn2: add configuration data for system power driver

The system power driver manages the SYSTOP power domain. Provide the
details such as the base adresses of System PPU's and the SOC IRQ's for
the same.

Change-Id: I0097f0a8be671708f5cf05b2276ccbbc57a69b5a
Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>