ARM: dts: Add @address property for CMA nodes

Previously, the CMA devicetree bindings were set up in such a way
that having multiple nodes with the same @address property would
merge them all into one node. The CMA bindings have since been
fixed so that is no longer an issue. Add back the @address part
of the bindings to fully match with the devicetree specification.

Change-Id: I8a527c4d94c4830a45384c02f63c8a120c40114b
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>