utils/hwstub: make stmp stub able to load in a MMU'ed environement

In might be useful to load hwstub in an environment with the MMU active,
in which case care must be taken on the order in which things are done.
Mostly, one should not disable the MMU before moving stuff around. The code
assumes the linking address (0 currently) is identity mapped.

Change-Id: I8d54ce9e8cadcde2e08990353ca7a46803731ca7
1 file changed