Silicon/ARM/NeoverseN1Soc: Define new PCDs and configure memory map

This patch introduces new PCDs required to enable
chip to chip interface and corresponding memory map is updated.

Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
Signed-off-by: Khasim Syed Mohammed <khasim.mohammed@arm.com>
Reviewed-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@Arm.com>