fix(ast2700): add device mapping for coherent memory

The coherent memory should be mapped as Device nGnRnE.
This fix adds the missing MMU attributes for coherent memory
if enabled.

Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Change-Id: I90b8de167c48f03392c9740f88f4b1e7b073a82d
1 file changed