Rename io_mem_xxx() to old_io_mem_xxx()

This renames io_mem_write() and io_mem_read() to old_io_mem_write()
and old_io_mem_read(), respectively. This is required to make room
for the new io_mem_xxx() functions from the new unified memory API
that will be integrated in the future.

Change-Id: Ic65d3f6e433b7e8080d12f1a61f9e601086c62c3
4 files changed