resources: update rdf diagrams

rdf_multi_chip.png and rdf_single_chip.png did not have draw.io meta
data in the png so could not easily be edited. So recreate diagrams in
draw.io and bundle in meta data.

Signed-off-by: Joel Goddard <joel.goddard@arm.com>
Change-Id: I60e00287940a46a41dfade2b3c7903163cc36038