Platform/ARM/N1sdp: Add support to parse NT_FW_CONFIG

NT_FW_CONFIG DTB contains platform information passed by
Tf-A boot stage.
This information is used for Virtual memory map generation
during PEI phase and passed on to DXE phase as a HOB, where
it is used in ConfigurationManagerDxe.

Signed-off-by: sahil <sahil@arm.com>
Change-Id: I54a86277719607eb00d4a472fae8f13c180eafca