This changes the style of dmc register accesses to be a read/write on
a base address plus a register offset instead of reinterpretting a
base address as a struct and accessing members within that struct.

Change-Id: Iead097cd6afdb830d8bc193608cd39d01ce5a6bc
Signed-off-by: Derek Basehore <dbasehore@chromium.org>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>