Use PStringLog in readVerityDevice when failed to open device

Some of the tests are failing with "Can't open /dev/block/dm-1", this
should help find out actual reason of the failure.

Test: checked log messages
Change-Id: I2c42f18bad905540d4b407e6fa3da83d814b2106
1 file changed
tree: 0ae42f7d23f84e5c4cb611d0b553028ec40b6f1f
  1. apexd/
  2. apexer/
  3. proto/
  4. shim/
  5. tests/
  6. CleanSpec.mk
  7. OWNERS
  8. PREUPLOAD.cfg