n1sdp: Introduce trusted board boot

In current boot flow, the SCP RAM firmware copies TF-BL31
from SCP QSPI memory to SRAM, and the AP core starts the
execution from it. With TBBR boot flow enabled SCP RAM
firmware will instead copy TF-BL1 to trusted SRAM.

This patch also removes BL33 info SDS structure as it is no longer
needed with the TBBR based boot.

Signed-off-by: sahil <sahil@arm.com>
Change-Id: I802a99fc7da6da5f5ba5ca5f7cb13a08c06146d0