Suppress errors that are not needed

The purpose of misc_writer is to write misc partition. However,
when it includes libfstab, it will probe files like kernal command
line (proc/cmdline) and metadata, which are permissions it does not
need.

Bug: 170189742
Test: Boot under permissive mode and find the errors gone.
Change-Id: Icda3200660a3bee5cadb6f5e0026fa71941ae5dc
2 files changed