Map console with MM_MODE_D under hftests

When driving hftests over UART, EL1 needs direct access to the console,
i.e. not via HVCs to EL2. The corresponding MMIO pages need to be mapped
as device memory. To that end, we export the necessary stage1_locked and
mpool structs from hftest/mm.c and call plat_console_mm_init().

Change-Id: I170e391981b717d0ff787d9ef4eebe80241cfd29
3 files changed