Revert "Revert "ARM: 7169/1: topdown mmap support""

This reverts commit f27e4f0e730b99ca4dabed0b408d96dbf73a8fac.

With 01b1dee in system/core to set ADDR_COMPAT_LAYOUT, this is
not needed any longer.

Bug: 8470684
Change-Id: I29506a63cbb61b7c1175f488ff0f7504d7d67c12
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>
Acked-by: Laura Abbot <lauraa@codeaurora.org>