Camera: fix NPE in buffer error callback

Check if the error stream has been removed first.
Also move some code in submitCaptureRequest so that access to
mConfiguredOutputs is within scope of mInterfaceLock, which
matches all other places accessing mConfiguredOutputs in the file.

Test: Camera CTS
Bug: 140374093, 140527066
Change-Id: I84921eb3a555f67a006548865f34502ab978e33b