Camera: Collect result metadata in case of output buffer errors

Output buffer error notifications during result processing shouldn't
impact the metadata result. As per API contract the result is still
valid and we should wait for it to arrive.

Bug: 62485653
Test: Manual using application,
Complete Camera/Camera2 CTS.

Change-Id: I58de1b7c48d10e25a71a1ffb709e66e619a6bdcf