build(intel): enable access to on-chip ram in BL31 for N5X

This adds the ncore ccu access and enable access to the
on-chip ram for N5X device in BL31.

Signed-off-by: Boon Khai Ng <boon.khai.ng@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
Change-Id: I713f6e93d33b6e91705547477ca32cfba5c8c13d