Log when reading manifest/matrices.

This is an extremely critical path, so:
- success information is logged, so that we can see exactly when a
  manifest is read (in case it is read incorrectly).
- the error log is doubled, in case it is somehow corrupted or too long
  for logcat, we still want the error code (e.g. even if corrupted by
  another library in the process).

Bug: 151696835
Test: boot and check logs (including error case, after deleting if
  statements)
Change-Id: Ibe50fd6ce3de955482dffb467b729d48b0d9d97b
Merged-In: Ibe50fd6ce3de955482dffb467b729d48b0d9d97b
1 file changed