Add correct header paths to dvr_api.h

Allows export script to find them for documentation insertion.

Also rename the included dvr_hardware_composer_defs file to
_types to match the copy that is in google3.

Bug: b/38379392
Test: ran export script
Change-Id: I9c9fe40bc1e6cc07739997f143fa036e713487c6
4 files changed