Add exception logging to CameraDeviceInfo retrieval failure

camera1 CameraAgent returns null CameraDeviceInfo if the underlying
camera device is broken. see b/16982203, this caused issues but was
invisible in logs. Adding logging to document true root cause of
any device info failures stemming from an underlying failure.

Bug: 16982203
Change-Id: I8a48714e1ddbde8b8eac35f149136d19efce5fb8