Backport of "adaptivedemux2: Allow data dash+xml manifest for uri" into 1.22
requested to merge tpm/gstreamer:mr-4811-backport-into-1.22-gstadaptivedemux_allow_data_uri into 1.22
Backport of !4811 (merged) "adaptivedemux2: Allow data dash+xml manifest for uri".
Commits:
- 513dd2c2 adaptivedemux2: Allow data dash+xml manifest for uri