libdmabufinfo: distinguish fdrefs from maprefs in dmabuf_dump report

Currently all dmabuf references are treated the same while for accounting
reasons they should be distinguished. Map references affect RSS and PSS
of a process while fd references if the file is not mapped are not
reflected in these stats. Modify dmabuf_dump report to clearly distinguish
between these two reference types.

Bug: 138148041
Test: dmabuf_dump -a
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ia3b2d54cdc2e05c6df501997c51833332b01cef5
1 file changed